Revert 171403

cc/software_renderer.cc

 // Copyright 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 "cc/software_renderer.h"
 
 #include <public/WebCompositorSoftwareOutputDevice.h>
 #include <public/WebImage.h>
 #include <public/WebSize.h>
 
@@ skipping 53 matching lines @@
 SoftwareRenderer::SoftwareRenderer(RendererClient* client, ResourceProvider* resourceProvider, WebCompositorSoftwareOutputDevice* outputDevice)
     : DirectRenderer(client, resourceProvider)
     , m_visible(true)
     , m_outputDevice(outputDevice)
     , m_skCurrentCanvas(0)
 {
     m_resourceProvider->setDefaultResourceType(ResourceProvider::Bitmap);
 
     m_capabilities.maxTextureSize = INT_MAX;
     m_capabilities.bestTextureFormat = GL_RGBA;
+    m_capabilities.contextHasCachedFrontBuffer = true;
     m_capabilities.usingSetVisibility = true;
     // The updater can access bitmaps while the SoftwareRenderer is using them.
     m_capabilities.allowPartialTextureUpdates = true;
 
     viewportChanged();
 }
 
 SoftwareRenderer::~SoftwareRenderer()
 {
 }
@@ skipping 295 matching lines @@
 }
 
 void SoftwareRenderer::setVisible(bool visible)
 {
     if (m_visible == visible)
         return;
     m_visible = visible;
 }
 
 }  // namespace cc