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..9b251d1e60fada0e31b4dd2ead32c39fbc7d2dd6 100644
--- a/cc/resource_update_controller.cc
+++ b/cc/resource_update_controller.cc
@@ -7,18 +7,17 @@
 #include <limits>
 
 #include "base/debug/trace_event.h"
+#include "cc/ganesh_resource_provider.h"
 #include "cc/prioritized_resource.h"
 #include "cc/resource_provider.h"
 #include "cc/texture_copier.h"
 #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 {
 
@@ -130,27 +129,25 @@ void ResourceUpdateController::updateTexture(ResourceUpdate update)
         DCHECK(m_resourceProvider->resourceType(texture->resourceId()) ==
                ResourceProvider::GLTexture);
 
-        WebGraphicsContext3D* paintContext = m_hasImplThread ?
-            WebSharedGraphicsContext3D::compositorThreadContext() :
-            WebSharedGraphicsContext3D::mainThreadContext();
-        GrContext* paintGrContext = m_hasImplThread ?
-            WebSharedGraphicsContext3D::compositorThreadGrContext() :
-            WebSharedGraphicsContext3D::mainThreadGrContext();
+        if (!m_resourceProvider->ganeshResourceProvider()->has_contexts())
+            return;
+
+        ResourceProvider::ScopedWriteLockGL lock(
+            m_resourceProvider, texture->resourceId());
 
         // 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
         // being written to in another.
-        ResourceProvider::ScopedWriteLockGL lock(
-            m_resourceProvider, texture->resourceId());
-        m_resourceProvider->flush();
+        GaneshResourceProvider::ScopedContextsFlushed offscreenContexts(
+            m_resourceProvider, m_resourceProvider->ganeshResourceProvider());
 
         // Make sure ganesh uses the correct GL context.
-        paintContext->makeContextCurrent();
+        offscreenContexts.context3d()->makeContextCurrent();
 
         // Create an accelerated canvas to draw on.
         skia::RefPtr<SkCanvas> canvas = createAcceleratedCanvas(
-            paintGrContext, texture->size(), lock.textureId());
+            offscreenContexts.gr_context(), texture->size(), lock.textureId());
 
         // The compositor expects the textures to be upside-down so it can flip
         // the final composited image. Ganesh renders the image upright so we
@@ -168,14 +165,6 @@ void ResourceUpdateController::updateTexture(ResourceUpdate update)
             pictureRect.x() - sourceRect.x() + destOffset.x(),
             pictureRect.y() - sourceRect.y() + destOffset.y());
         canvas->drawPicture(*update.picture);
-
-        // Flush ganesh context so that all the rendered stuff appears on the
-        // texture.
-        paintGrContext->flush();
-
-        // Flush the GL context so rendering results from this context are
-        // visible in the compositor's context.
-        paintContext->flush();
     }
 
     if (update.bitmap) {