First step at getting rid of anonymous blocks and continuations.

-Add RenderParagraph and display:paragraph. This is the only
render type that's allowed to contain inlines or text.
-If you put text nodes directly in a non-paragraph, wrap them
in an anonymous paragraph. This may not be the place we want
to end up, but it's a good stopgap to make it so we don't
crash in this case.
-Make StyleAdjuster force that non-paragraph blocks only contain
RenderBlock subclasses and that paragraphs and inlines only contain
inlines.
-Considerably simplify addChildIgnoringAnonymousColumnBlocks
now that we only create anonymous blocks for the case of
text nodes in non-paragraphs. Also get rid of the behavior
where we try to group multiple nodes into a single
anonymous block.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/729693003

engine/src/flutter/tests/layout/continuations-expected.txt

@@ -0,0 +1,13 @@
+layer at (0,0) size 800x600
+  RenderView {#document} at (0,0) size 800x600
+layer at (0,0) size 800x19
+  RenderBlock {sky} at (0,0) size 800x19
+    RenderBlock {div} at (0,0) size 800x19
+      RenderBlock {span} at (0,0) size 800x19
+        RenderBlock {div} at (0,0) size 25.22x19
+          RenderBlock (anonymous) at (0,0) size 25.22x19
+            RenderText {#text} at (0,0) size 26x19
+              text run at (0,0) width 26: "foo"
+        RenderText {#text} at (25,0) size 27x19
+          text run at (25,0) width 27: "bar"
+

engine/src/flutter/tests/layout/continuations.sky

@@ -0,0 +1,4 @@
+<sky>
+    <import src="../resources/dump-as-render-tree.sky" />
+    <div><span style="display: paragraph"><div>foo</div>bar</span></div>
+</sky>

engine/src/flutter/tests/lowlevel/abarth.sky

@@ -19,6 +19,13 @@ body {
   background-size: cover;
 }
 
+.line,
+.link,
+.name,
+.photograph-credit {
+  display: paragraph;
+}
+
 .photograph-credit {
   position: absolute;
   right: 0;

engine/src/flutter/tests/lowlevel/hello-world-expected.txt

@@ -2,6 +2,7 @@ layer at (0,0) size 800x600
   RenderView {#document} at (0,0) size 800x600
 layer at (0,0) size 800x19
   RenderBlock {foo} at (0,0) size 800x19
-    RenderText {#text} at (0,0) size 99x19
-      text run at (0,0) width 99: "Hello World!"
+    RenderBlock (anonymous) at (0,0) size 800x19
+      RenderText {#text} at (0,0) size 99x19
+        text run at (0,0) width 99: "Hello World!"
 

engine/src/flutter/tests/lowlevel/iframe-expected.txt

@@ -10,8 +10,9 @@ layer at (0,0) size 800x506
         RenderText {#text} at (0,0) size 72x19
           text run at (0,0) width 72: "element."
     RenderBlock {div} at (0,228) size 800x200
-      RenderText {#text} at (0,0) size 99x19
-        text run at (0,0) width 99: "Placeholder."
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 99x19
+          text run at (0,0) width 99: "Placeholder."
     RenderBlock {div} at (0,428) size 800x78
       RenderBlock (anonymous) at (0,0) size 800x19
         RenderText {#text} at (0,0) size 218x19

engine/src/flutter/tests/lowlevel/scrollbar-expected.txt

@@ -5,48 +5,63 @@ layer at (0,0) size 800x400
 layer at (0,0) size 800x400 scrollHeight 1500
   RenderBlock {scroller} at (0,0) size 800x400
     RenderBlock {div} at (0,0) size 800x100
-      RenderText {#text} at (0,0) size 10x19
-        text run at (0,0) width 10: "a"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 10x19
+          text run at (0,0) width 10: "a"
     RenderBlock {div} at (0,100) size 800x100
-      RenderText {#text} at (0,0) size 11x19
-        text run at (0,0) width 11: "b"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 11x19
+          text run at (0,0) width 11: "b"
     RenderBlock {div} at (0,200) size 800x100
-      RenderText {#text} at (0,0) size 9x19
-        text run at (0,0) width 9: "c"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 9x19
+          text run at (0,0) width 9: "c"
     RenderBlock {div} at (0,300) size 800x100
-      RenderText {#text} at (0,0) size 11x19
-        text run at (0,0) width 11: "d"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 11x19
+          text run at (0,0) width 11: "d"
     RenderBlock {div} at (0,400) size 800x100
-      RenderText {#text} at (0,0) size 10x19
-        text run at (0,0) width 10: "e"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 10x19
+          text run at (0,0) width 10: "e"
     RenderBlock {div} at (0,500) size 800x100
-      RenderText {#text} at (0,0) size 6x19
-        text run at (0,0) width 6: "f"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 6x19
+          text run at (0,0) width 6: "f"
     RenderBlock {div} at (0,600) size 800x100
-      RenderText {#text} at (0,0) size 11x19
-        text run at (0,0) width 11: "g"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 11x19
+          text run at (0,0) width 11: "g"
     RenderBlock {div} at (0,700) size 800x100
-      RenderText {#text} at (0,0) size 11x19
-        text run at (0,0) width 11: "h"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 11x19
+          text run at (0,0) width 11: "h"
     RenderBlock {div} at (0,800) size 800x100
-      RenderText {#text} at (0,0) size 5x19
-        text run at (0,0) width 5: "i"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 5x19
+          text run at (0,0) width 5: "i"
     RenderBlock {div} at (0,900) size 800x100
-      RenderText {#text} at (0,0) size 5x19
-        text run at (0,0) width 5: "j"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 5x19
+          text run at (0,0) width 5: "j"
     RenderBlock {div} at (0,1000) size 800x100
-      RenderText {#text} at (0,0) size 10x19
-        text run at (0,0) width 10: "k"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 10x19
+          text run at (0,0) width 10: "k"
     RenderBlock {div} at (0,1100) size 800x100
-      RenderText {#text} at (0,0) size 5x19
-        text run at (0,0) width 5: "l"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 5x19
+          text run at (0,0) width 5: "l"
     RenderBlock {div} at (0,1200) size 800x100
-      RenderText {#text} at (0,0) size 16x19
-        text run at (0,0) width 16: "m"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 16x19
+          text run at (0,0) width 16: "m"
     RenderBlock {div} at (0,1300) size 800x100
-      RenderText {#text} at (0,0) size 11x19
-        text run at (0,0) width 11: "n"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 11x19
+          text run at (0,0) width 11: "n"
     RenderBlock {div} at (0,1400) size 800x100
-      RenderText {#text} at (0,0) size 10x19
-        text run at (0,0) width 10: "o"
+      RenderBlock (anonymous) at (0,0) size 800x19
+        RenderText {#text} at (0,0) size 10x19
+          text run at (0,0) width 10: "o"