cc: Partial tile update for one-copy raster.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 6bb177c39d9ba6386b1494252bddef5f0ce8ab11..5e9c59fa4c03ef3fdf243b3f4cbf476c940daeb5 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1141,9 +1141,11 @@ static void AppendCompositorCommandLineFlags(base::CommandLine* command_line) {
   // crbug.com/490362
   gfx::GpuMemoryBuffer::Format format = gfx::GpuMemoryBuffer::BGRA_8888;
 
-  // TODO(danakj): When one-copy uploads support partial update, change this
-  // usage to PERSISTENT_MAP for one-copy.
   gfx::GpuMemoryBuffer::Usage usage = gfx::GpuMemoryBuffer::MAP;
+  if (HavePersistentGpuMemoryBuffers()) {
+    usage = gfx::GpuMemoryBuffer::PERSISTENT_MAP;
+    command_line->AppendSwitch(switches::kUsePersistentGpuMemoryBuffers);
+  }
 
   command_line->AppendSwitchASCII(
       switches::kUseImageTextureTarget,