cc: Route offscreen context creation for compositor to the browser.

cc/resource_update_controller.cc

Index: cc/resource_update_controller.cc
diff --git a/cc/resource_update_controller.cc b/cc/resource_update_controller.cc
index 1177d5372fcaa69b0d8012bf20243bdc572c23e9..b65c11772a6912ebe94bafbfd13a9b8588f605ad 100644
--- a/cc/resource_update_controller.cc
+++ b/cc/resource_update_controller.cc
@@ -13,12 +13,10 @@
 #include "cc/thread.h"
 #include "skia/ext/refptr.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
-#include "third_party/WebKit/Source/Platform/chromium/public/WebSharedGraphicsContext3D.h"
 #include "third_party/khronos/GLES2/gl2.h"
 #include "third_party/skia/include/gpu/SkGpuDevice.h"
 
 using WebKit::WebGraphicsContext3D;
-using WebKit::WebSharedGraphicsContext3D;
 
 namespace {
 
@@ -124,19 +122,20 @@ void ResourceUpdateController::updateTexture(ResourceUpdate update)
         gfx::Rect sourceRect = update.source_rect;
         gfx::Vector2d destOffset = update.dest_offset;
 
+        WebGraphicsContext3D* paintContext = m_resourceProvider->offscreenGraphicsContext3d();
+        if (!paintContext)
+            return;
+
+        GrContext* paintGrContext = m_resourceProvider->offscreenGrContext();
+        if (!paintGrContext)
+            return;
+
         texture->acquireBackingTexture(m_resourceProvider);
         DCHECK(texture->haveBackingTexture());
 
         DCHECK(m_resourceProvider->resourceType(texture->resourceId()) ==
                ResourceProvider::GLTexture);
 
-        WebGraphicsContext3D* paintContext = m_hasImplThread ?
-            WebSharedGraphicsContext3D::compositorThreadContext() :
-            WebSharedGraphicsContext3D::mainThreadContext();
-        GrContext* paintGrContext = m_hasImplThread ?
-            WebSharedGraphicsContext3D::compositorThreadGrContext() :
-            WebSharedGraphicsContext3D::mainThreadGrContext();
-
         // Flush the context in which the backing texture is created so that it
         // is available in other shared contexts. It is important to do here
         // because the backing texture is created in one context while it is