[Aura] Fix for a flash of black frame when resizing with the new resize logic.

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index 6c2339fb720c3874379dafcd41bf7bb978f6a959..513551f9ad8e0467ecfadf39cb43c333d40bd44d 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -758,6 +758,7 @@ void RenderWidgetHostViewAura::WasHidden() {
 
 void RenderWidgetHostViewAura::SetSize(const gfx::Size& size) {
   SetBounds(gfx::Rect(window_->bounds().origin(), size));
+  previous_damage_.op(RectToSkIRect(gfx::Rect(size)), SkRegion::kUnion_Op);

[piman, 2013/04/09 00:11:49]

Why is this needed?
When we resize, the new frame should have full damage. We DCHECK for it. So the
previous damage should not have any effect.

 }
 
 void RenderWidgetHostViewAura::SetBounds(const gfx::Rect& rect) {