Make remote CoreAnimation GPU-switching aware

Send the CGL renderer ID for the context being used by the
CAOpenGLLayer.

Tested with WebGL apps, gfxCardStatus switching.

BUG=312462

Review URL: https://codereview.chromium.org/647053002

Cr-Commit-Position: refs/heads/master@{#299204}

content/common/gpu/image_transport_surface_calayer_mac.mm

@@ -4,6 +4,8 @@
 
 #include "content/common/gpu/image_transport_surface_calayer_mac.h"
 
+#include <OpenGL/CGLRenderers.h>
+
 #include "base/command_line.h"
 #include "base/mac/sdk_forward_declarations.h"
 #include "content/common/gpu/surface_handle_types_mac.h"
@@ -291,6 +293,14 @@ void CALayerStorageProvider::LayerDoDraw() {
   glBindTexture(GL_TEXTURE_RECTANGLE_ARB, 0);
   glDisable(GL_TEXTURE_RECTANGLE_ARB);
 
+  GLint current_renderer_id = 0;
+  if (CGLGetParameter(CGLGetCurrentContext(),
+                      kCGLCPCurrentRendererID,
+                      &current_renderer_id) == kCGLNoError) {
+    current_renderer_id &= kCGLRendererIDMatchingMask;
+    transport_surface_->SetRendererID(current_renderer_id);
+  }
+
   // Allow forward progress in the context now that the swap is complete.
   UnblockBrowserIfNeeded();
 }

content/common/gpu/image_transport_surface_fbo_mac.h

@@ -82,6 +82,7 @@ class ImageTransportSurfaceFBO
   void SendSwapBuffers(uint64 surface_handle,
                        const gfx::Size pixel_size,
                        float scale_factor);
+  void SetRendererID(int renderer_id);
 
  protected:
   // ImageTransportSurface implementation

content/common/gpu/image_transport_surface_fbo_mac.mm

@@ -138,6 +138,11 @@ void ImageTransportSurfaceFBO::SendSwapBuffers(uint64 surface_handle,
   is_swap_buffers_send_pending_ = false;
 }
 
+void ImageTransportSurfaceFBO::SetRendererID(int renderer_id) {
+  if (renderer_id)
+    context_->share_group()->SetRendererID(renderer_id);
+}
+
 bool ImageTransportSurfaceFBO::PostSubBuffer(
     int x, int y, int width, int height) {
   // Mac does not support sub-buffer swaps.
@@ -163,7 +168,7 @@ void* ImageTransportSurfaceFBO::GetDisplay() {
 
 void ImageTransportSurfaceFBO::OnBufferPresented(
     const AcceleratedSurfaceMsg_BufferPresented_Params& params) {
-  context_->share_group()->SetRendererID(params.renderer_id);
+  SetRendererID(params.renderer_id);
   storage_provider_->SwapBuffersAckedByBrowser(params.disable_throttling);
 }