cc: Partial draw without partial swap support.

content/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.cc

 // 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/browser/compositor/gpu_surfaceless_browser_compositor_output_surface.h"
 
 #include <utility>
 
 #include "cc/output/output_surface_client.h"
 #include "cc/output/output_surface_frame.h"
@@ skipping 56 matching lines @@
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::SwapBuffers(
     cc::OutputSurfaceFrame frame) {
   DCHECK(buffer_queue_);
   DCHECK(reshape_size_ == frame.size);
   // TODO(ccameron): What if a swap comes again before OnGpuSwapBuffersCompleted
   // happens, we'd see the wrong swap size there?
   swap_size_ = reshape_size_;
   buffer_queue_->SwapBuffers(frame.sub_buffer_rect ? *frame.sub_buffer_rect
-                                                   : gfx::Rect(swap_size_));
+                                                   : frame.damage_rect);
   GpuBrowserCompositorOutputSurface::SwapBuffers(std::move(frame));
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::BindFramebuffer() {
   DCHECK(buffer_queue_);
   buffer_queue_->BindFramebuffer();
 }
 
+bool GpuSurfacelessBrowserCompositorOutputSurface::CanPartialDraw(
+    const gfx::Rect& damage) {
+  return buffer_queue_->CanPartialDraw(damage);
+}
+
 GLenum GpuSurfacelessBrowserCompositorOutputSurface::
     GetFramebufferCopyTextureFormat() {
   return buffer_queue_->internal_format();
 }
 
 void GpuSurfacelessBrowserCompositorOutputSurface::Reshape(
     const gfx::Size& size,
     float device_scale_factor,
     const gfx::ColorSpace& color_space,
     bool has_alpha,
@@ skipping 18 matching lines @@
     force_swap = true;
   }
   buffer_queue_->PageFlipComplete();
   GpuBrowserCompositorOutputSurface::OnGpuSwapBuffersCompleted(
       latency_info, result, params_mac);
   if (force_swap)
     client_->SetNeedsRedrawRect(gfx::Rect(swap_size_));
 }
 
 }  // namespace content