cc: Partial tile update for one-copy raster.

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index f4407f0d9600f7bc486f5e12e7e95b8f58e497cc..c05cddea55da6dca96418dd7f9b33d89a066af7a 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -578,6 +578,8 @@ void RenderThreadImpl::Init() {
 
   is_zero_copy_enabled_ = command_line.HasSwitch(switches::kEnableZeroCopy);
   is_one_copy_enabled_ = !command_line.HasSwitch(switches::kDisableOneCopy);
+  have_persistent_gpu_memory_buffers_ =
+      command_line.HasSwitch(switches::kUsePersistentGpuMemoryBuffers);
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   is_elastic_overscroll_enabled_ = base::mac::IsOSLionOrLater();
@@ -1423,6 +1425,10 @@ bool RenderThreadImpl::IsOneCopyEnabled() {
   return is_one_copy_enabled_;
 }
 
+bool RenderThreadImpl::HavePersistentGpuMemoryBuffers() {
+  return have_persistent_gpu_memory_buffers_;
+}
+
 bool RenderThreadImpl::IsElasticOverscrollEnabled() {
   return is_elastic_overscroll_enabled_;
 }