Allow to have a transparent UA dependent background.

content/browser/renderer_host/render_widget_host_view_aura.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_widget_host_view_aura.h"
 
 #include <set>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 940 matching lines @@
 #endif  // defined(OS_WIN)
 }
 
 void RenderWidgetHostViewAura::Focus() {
   // Make sure we have a FocusClient before attempting to Focus(). In some
   // situations we may not yet be in a valid Window hierarchy (such as reloading
   // after out of memory discarded the tab).
   aura::client::FocusClient* client = aura::client::GetFocusClient(window_);
   if (client)
     window_->Focus();
+
+  // XXX This is for testing, it has to be moved to a unit or browser test.
+  // Which would call:
+  // content::RenderWidgetHostView->SetBackgroundColor(SK_ColorTRANSPARENT)
+  // content::RenderWidgetHostView->SetBackgroundOpaque(true)
+  SetBackgroundColor(SK_ColorTRANSPARENT);
+  SetBackgroundOpaque(true);
 }
 
 bool RenderWidgetHostViewAura::HasFocus() const {
   return window_->HasFocus();
 }
 
 bool RenderWidgetHostViewAura::IsSurfaceAvailableForCopy() const {
   return delegated_frame_host_->CanCopyToBitmap();
 }
 
 bool RenderWidgetHostViewAura::IsShowing() {
   return window_->IsVisible();
 }
 
 gfx::Rect RenderWidgetHostViewAura::GetViewBounds() const {
   return window_->GetBoundsInScreen();
 }
 
 void RenderWidgetHostViewAura::SetBackgroundColor(SkColor color) {
   RenderWidgetHostViewBase::SetBackgroundColor(color);
-  bool opaque = GetBackgroundOpaque();
-  host_->SetBackgroundOpaque(opaque);
-  window_->layer()->SetFillsBoundsOpaquely(opaque);
+  host_->SetBackgroundColor(color);
   window_->layer()->SetColor(color);
 }
 
+void RenderWidgetHostViewAura::SetBackgroundOpaque(bool opaque) {
+  RenderWidgetHostViewBase::SetBackgroundOpaque(opaque);
+  host_->SetBackgroundOpaque(opaque);
+  window_->layer()->SetFillsBoundsOpaquely(opaque);
+}
+
 gfx::Size RenderWidgetHostViewAura::GetVisibleViewportSize() const {
   gfx::Rect requested_rect(GetRequestedRendererSize());
   requested_rect.Inset(insets_);
   return requested_rect.size();
 }
 
 void RenderWidgetHostViewAura::SetInsets(const gfx::Insets& insets) {
   if (insets != insets_) {
     insets_ = insets;
     host_->WasResized();
@@ skipping 2113 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content