Mac: Add partial swap support to NSOpenGLContext path

content/common/gpu/image_transport_surface_fbo_mac.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/common/gpu/image_transport_surface_fbo_mac.h"
 
 #include "base/trace_event/trace_event.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/gpu/image_transport_surface_calayer_mac.h"
 #include "content/common/gpu/image_transport_surface_iosurface_mac.h"
@@ skipping 153 matching lines @@
       !frontbuffer_suggested_allocation_ &&
       has_complete_framebuffer_) {
     DestroyFramebuffer();
   } else if (backbuffer_suggested_allocation_ && !has_complete_framebuffer_) {
     AllocateOrResizeFramebuffer(pixel_size_, scale_factor_);
   }
 }
 
 gfx::SwapResult ImageTransportSurfaceFBO::SwapBuffers() {
   TRACE_EVENT0("gpu", "ImageTransportSurfaceFBO::SwapBuffers");
+  pending_swap_pixel_damage_rect_ = gfx::Rect(pixel_size_);
   return SwapBuffersInternal() ? gfx::SwapResult::SWAP_ACK
                                : gfx::SwapResult::SWAP_FAILED;
 }
 
 bool ImageTransportSurfaceFBO::SwapBuffersInternal() {
   DCHECK(backbuffer_suggested_allocation_);
   if (!frontbuffer_suggested_allocation_)
     return true;
   glFlush();
 
   // It is the responsibility of the storage provider to send the swap IPC.
   is_swap_buffers_send_pending_ = true;
   storage_provider_->SwapBuffers();
 
   // The call to swapBuffers could potentially result in an immediate draw.
   // Ensure that any changes made to the context's state are restored.
   context_->RestoreStateIfDirtiedExternally();
   return true;
 }
 
 void ImageTransportSurfaceFBO::SendSwapBuffers(uint64 surface_handle,
                                                const gfx::Size pixel_size,
                                                float scale_factor) {
   TRACE_EVENT0("gpu", "ImageTransportSurfaceFBO::SendSwapBuffers");
   GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params params;
   params.surface_handle = surface_handle;
   params.size = pixel_size;
+  params.damage_rect = pending_swap_pixel_damage_rect_;
   params.scale_factor = scale_factor;
   params.latency_info.swap(latency_info_);
   helper_->SendAcceleratedSurfaceBuffersSwapped(params);
   is_swap_buffers_send_pending_ = false;
+  pending_swap_pixel_damage_rect_ = gfx::Rect();
 }
 
 void ImageTransportSurfaceFBO::SetRendererID(int renderer_id) {
   if (renderer_id)
     context_->share_group()->SetRendererID(renderer_id);
 }
 
 gfx::SwapResult ImageTransportSurfaceFBO::PostSubBuffer(int x,
                                                         int y,
                                                         int width,
                                                         int height) {
   TRACE_EVENT0("gpu", "ImageTransportSurfaceFBO::PostSubBuffer");
+  pending_swap_pixel_damage_rect_.Union(gfx::Rect(x, y, width, height));
   return SwapBuffersInternal() ? gfx::SwapResult::SWAP_ACK
                                : gfx::SwapResult::SWAP_FAILED;
 }
 
 bool ImageTransportSurfaceFBO::SupportsPostSubBuffer() {
   return true;
 }
 
 gfx::Size ImageTransportSurfaceFBO::GetSize() {
   return pixel_size_;
@@ skipping 184 matching lines @@
   }
 
   has_complete_framebuffer_ = true;
   storage_provider_->FrameSizeChanged(pixel_size_, scale_factor_);
 
   glBindTexture(texture_target, previous_texture_id);
   // The FBO remains bound for this GL context.
 }
 
 }  // namespace content