Change default force composite setting to true

Source/web/WebViewImpl.cpp

Index: Source/web/WebViewImpl.cpp
diff --git a/Source/web/WebViewImpl.cpp b/Source/web/WebViewImpl.cpp
index 4ba3f0cac83701f6a1535202b38c4d5ba6022374..6be5a0ed237d4ae02d8b4778bff01b45f8be389e 100644
--- a/Source/web/WebViewImpl.cpp
+++ b/Source/web/WebViewImpl.cpp
@@ -3807,6 +3807,9 @@ void WebViewImpl::setIsAcceleratedCompositingActive(bool active)
     if (m_isAcceleratedCompositingActive == active)
         return;
 
+    if (!m_client)

[enne (OOO), 2014/05/15 19:29:21]

Other parts of WebViewImpl are robust to a missing client.  This part needs to
be too now once the force composite by default flag is flipped and this code
path is hit in content unit tests.

+        return;
+
     if (!active) {
         m_isAcceleratedCompositingActive = false;
         // We need to finish all GL rendering before sending didDeactivateCompositor() to prevent