Enable texture readback support for Android

content/browser/renderer_host/image_transport_factory_android.cc

Index: content/browser/renderer_host/image_transport_factory_android.cc
diff --git a/content/browser/renderer_host/image_transport_factory_android.cc b/content/browser/renderer_host/image_transport_factory_android.cc
index 7299656b5e86130245d2c02a26b8d4671a8f40b5..d7e0505eba68bd68ac938909ea89596661abfc7b 100644
--- a/content/browser/renderer_host/image_transport_factory_android.cc
+++ b/content/browser/renderer_host/image_transport_factory_android.cc
@@ -7,7 +7,9 @@
 #include "base/memory/singleton.h"
 #include "content/browser/gpu/browser_gpu_channel_host_factory.h"
 #include "content/common/gpu/gpu_process_launch_causes.h"
+#include "content/common/gpu/client/gl_helper.h"
 #include "content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h"
+#include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
 
 using content::BrowserGpuChannelHostFactory;
 
@@ -73,9 +75,15 @@ uint32_t ImageTransportFactoryAndroid::InsertSyncPoint() {
   return context_->insertSyncPoint();
 }
 
-WebGraphicsContext3DCommandBufferImpl*
-ImageTransportFactoryAndroid::GetContext3D() {
+WebKit::WebGraphicsContext3D* ImageTransportFactoryAndroid::GetContext3D() {
   return context_.get();
 }
 
+GLHelper* ImageTransportFactoryAndroid::GetGLHelper() {
+  if (!gl_helper_.get())
+    gl_helper_.reset(new GLHelper(GetContext3D(), NULL));
+
+  return gl_helper_.get();
+}
+
 }  // namespace content