Carry out a resize even if no layout has been performed.

Source/core/page/Page.cpp

Index: Source/core/page/Page.cpp
diff --git a/Source/core/page/Page.cpp b/Source/core/page/Page.cpp
index a58f0006b43da66b0e9ffbc32c7e1b1a37a62ca4..7101f0ca271b2725a1aec5e02efcd7907905ac16 100644
--- a/Source/core/page/Page.cpp
+++ b/Source/core/page/Page.cpp
@@ -459,6 +459,10 @@ void Page::settingsChanged(SettingsDelegate::ChangeType changeType)
     case SettingsDelegate::StyleChange:
         setNeedsRecalcStyleInAllFrames();
         break;
+    case SettingsDelegate::ForceZeroLayoutHeightChange:

[gsennton, 2015/02/13 19:41:07]

A new changeType was added here since we would like to call contentsResized()
when the forceZeroLayoutHeightChange setting is updated.
Since the previously used changeType ViewportDescriptionChange was used by other
settings updating those settings would also caused a call to contentsResized().
This extra call seems to have been the source of the flakiness in the earlier
patch sets.

+        if (mainFrame() && mainFrame()->isLocalFrame())
+            deprecatedLocalMainFrame()->view()->didChangeForceLayoutHeightMode();
+        break;
     case SettingsDelegate::ViewportDescriptionChange:
         if (mainFrame() && mainFrame()->isLocalFrame())
             deprecatedLocalMainFrame()->document()->updateViewportDescription();