Implement WebKitPlatformSupport::canAccelerate2dCanvas

content/renderer/renderer_webkitplatformsupport_impl.cc

Index: content/renderer/renderer_webkitplatformsupport_impl.cc
diff --git a/content/renderer/renderer_webkitplatformsupport_impl.cc b/content/renderer/renderer_webkitplatformsupport_impl.cc
index 1c5fc6fd1b3878441e361e9c01f719e86ff607d8..efd2700df6ce6ea72184db3ef9a43bac81f47f94 100644
--- a/content/renderer/renderer_webkitplatformsupport_impl.cc
+++ b/content/renderer/renderer_webkitplatformsupport_impl.cc
@@ -20,6 +20,7 @@
 #include "content/common/view_messages.h"
 #include "content/common/webmessageportchannel_impl.h"
 #include "content/public/common/content_switches.h"
+#include "content/public/common/gpu_info.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/renderer/gamepad_shared_memory_reader.h"
 #include "content/renderer/media/audio_device.h"
@@ -659,3 +660,17 @@ RendererWebKitPlatformSupportImpl::createPeerConnectionHandler(
     return NULL;
   return render_view->CreatePeerConnectionHandler(client);
 }
+
+bool RendererWebKitPlatformSupportImpl::canAccelerate2dCanvas() {
+  RenderThreadImpl* thread = RenderThreadImpl::current();
+  GpuChannelHost* host = thread->EstablishGpuChannelSync(
+      content::CAUSE_FOR_GPU_LAUNCH_CANVAS_2D);
+  if (!host)
+    return false;
+
+  const content::GPUInfo& gpu_info = host->gpu_info();
+  if (gpu_info.can_lose_context || gpu_info.software_rendering)
+    return false;
+
+  return true;
+}