Use solid color layer for delegated surface.

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 "base/auto_reset.h"
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/callback_helpers.h"
@@ skipping 456 matching lines @@
       GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
   SetOverscrollControllerEnabled(overscroll_enabled);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewAura, RenderWidgetHostView implementation:
 
 void RenderWidgetHostViewAura::InitAsChild(
     gfx::NativeView parent_view) {
   window_->SetType(ui::wm::WINDOW_TYPE_CONTROL);
-  window_->Init(aura::WINDOW_LAYER_TEXTURED);
+  window_->Init(aura::WINDOW_LAYER_SOLID_COLOR);
   window_->SetName("RenderWidgetHostViewAura");
+  window_->layer()->SetColor(SK_ColorWHITE);
 }
 
 void RenderWidgetHostViewAura::InitAsPopup(
     RenderWidgetHostView* parent_host_view,
     const gfx::Rect& bounds_in_screen) {
   popup_parent_host_view_ =
       static_cast<RenderWidgetHostViewAura*>(parent_host_view);
 
   // TransientWindowClient may be NULL during tests.
   aura::client::TransientWindowClient* transient_window_client =
       aura::client::GetTransientWindowClient();
   RenderWidgetHostViewAura* old_child =
       popup_parent_host_view_->popup_child_host_view_;
   if (old_child) {
     // TODO(jhorwich): Allow multiple popup_child_host_view_ per view, or
     // similar mechanism to ensure a second popup doesn't cause the first one
     // to never get a chance to filter events. See crbug.com/160589.
     DCHECK(old_child->popup_parent_host_view_ == popup_parent_host_view_);
     if (transient_window_client) {
       transient_window_client->RemoveTransientChild(
         popup_parent_host_view_->window_, old_child->window_);
     }
     old_child->popup_parent_host_view_ = NULL;
   }
   popup_parent_host_view_->popup_child_host_view_ = this;
   window_->SetType(ui::wm::WINDOW_TYPE_MENU);
-  window_->Init(aura::WINDOW_LAYER_TEXTURED);
+  window_->Init(aura::WINDOW_LAYER_SOLID_COLOR);
   window_->SetName("RenderWidgetHostViewAura");
+  window_->layer()->SetColor(SK_ColorWHITE);
 
   aura::Window* root = popup_parent_host_view_->window_->GetRootWindow();
   aura::client::ParentWindowWithContext(window_, root, bounds_in_screen);
   // Setting the transient child allows for the popup to get mouse events when
   // in a system modal dialog.
   // This fixes crbug.com/328593.
   if (transient_window_client) {
     transient_window_client->AddTransientChild(
         popup_parent_host_view_->window_, window_);
   }
 
   SetBounds(bounds_in_screen);
   Show();
   if (NeedsMouseCapture())
     window_->SetCapture();
 
   event_filter_for_popup_exit_.reset(new EventFilterForPopupExit(this));
 }
 
 void RenderWidgetHostViewAura::InitAsFullscreen(
     RenderWidgetHostView* reference_host_view) {
   is_fullscreen_ = true;
   window_->SetType(ui::wm::WINDOW_TYPE_NORMAL);
-  window_->Init(aura::WINDOW_LAYER_TEXTURED);
+  window_->Init(aura::WINDOW_LAYER_SOLID_COLOR);
   window_->SetName("RenderWidgetHostViewAura");
   window_->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
+  window_->layer()->SetColor(SK_ColorWHITE);
 
   aura::Window* parent = NULL;
   gfx::Rect bounds;
   if (reference_host_view) {
     aura::Window* reference_window =
         static_cast<RenderWidgetHostViewAura*>(reference_host_view)->window_;
     if (reference_window) {
       host_tracker_.reset(new aura::WindowTracker);
       host_tracker_->Add(reference_window);
     }
@@ skipping 254 matching lines @@
 }
 
 gfx::Rect RenderWidgetHostViewAura::GetViewBounds() const {
   return window_->GetBoundsInScreen();
 }
 
 void RenderWidgetHostViewAura::SetBackgroundOpaque(bool opaque) {
   RenderWidgetHostViewBase::SetBackgroundOpaque(opaque);
   host_->SetBackgroundOpaque(opaque);
   window_->layer()->SetFillsBoundsOpaquely(opaque);
+  SkColor background_color = opaque ? SK_ColorWHITE : SK_ColorTRANSPARENT;
+  window_->layer()->SetColor(background_color);
 }
 
 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_) {
@@ skipping 857 matching lines @@
   return popup_type_ == blink::WebPopupTypeNone;
 }
 
 void RenderWidgetHostViewAura::OnCaptureLost() {
   host_->LostCapture();
   if (touch_editing_client_)
     touch_editing_client_->EndTouchEditing(false);
 }
 
 void RenderWidgetHostViewAura::OnPaint(gfx::Canvas* canvas) {
-  // For non-opaque windows, we don't draw anything, since we depend on the
-  // canvas coming from the compositor to already be initialized as
-  // transparent.
-  if (window_->layer()->fills_bounds_opaquely())
-    canvas->DrawColor(SK_ColorWHITE);
+  DCHECK(false);

[piman, 2014/10/09 06:30:27]

nit: NOTREACHED()

 }
 
 void RenderWidgetHostViewAura::OnDeviceScaleFactorChanged(
     float device_scale_factor) {
   if (!host_ || !window_->GetRootWindow())
     return;
 
   UpdateScreenInfo(window_);
 
   const gfx::Display display = gfx::Screen::GetScreenFor(window_)->
@@ skipping 870 matching lines @@
 
 ////////////////////////////////////////////////////////////////////////////////
 // RenderWidgetHostViewBase, public:
 
 // static
 void RenderWidgetHostViewBase::GetDefaultScreenInfo(WebScreenInfo* results) {
   GetScreenInfoForWindow(results, NULL);
 }
 
 }  // namespace content