Disable partial swaps for webview guest renderer until we can figure out how to do that properly.

content/renderer/render_view_impl.cc

Index: content/renderer/render_view_impl.cc
diff --git a/content/renderer/render_view_impl.cc b/content/renderer/render_view_impl.cc
index e29914ad8ba78a2da4a9e772aca9f33d18e41cf7..dc68f494e6021cdaaebff63d63b85c2e2a282dd9 100644
--- a/content/renderer/render_view_impl.cc
+++ b/content/renderer/render_view_impl.cc
@@ -734,6 +734,7 @@ void RenderViewImpl::Initialize(RenderViewImplParams* params) {
   webview()->setDeviceScaleFactor(device_scale_factor_);
   webview()->settings()->setAcceleratedCompositingForFixedPositionEnabled(
       ShouldUseFixedPositionCompositing(device_scale_factor_));
+  allow_partial_swap_ = params->renderer_prefs.allow_partial_swap;

[jamesr, 2013/03/06 22:37:59]

We store the entire renderer_prefs struct in renderer_prefs_.  Why spend extra
memory keeping an additional copy of the bool?

[alexst (slow to review), 2013/03/06 23:12:34]

renderer_preferences_ is stored on RenderViewImpl, and RenderWIdgetCompositor
has RenderWidget. I added the bool as an alternative to making
allow_partial_swap()  virtual.

 
   webkit_preferences_.Apply(webview());
   webview()->initializeMainFrame(this);