Add a flag to disable partial raster in renderer

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 998e05bc4df3d78f332229deb29ad6c0dd522904..bee1367882fcf7fe1c07499748fca106e78509ca 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -663,8 +663,8 @@ void RenderThreadImpl::Init() {
       !command_line.HasSwitch(cc::switches::kDisableThreadedAnimation);
 
   is_zero_copy_enabled_ = command_line.HasSwitch(switches::kEnableZeroCopy);
-  is_persistent_gpu_memory_buffer_enabled_ =
-      command_line.HasSwitch(switches::kEnablePersistentGpuMemoryBuffer);
+  is_partial_raster_enabled_ =
+      command_line.HasSwitch(switches::kEnablePartialRaster);
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
   is_elastic_overscroll_enabled_ = base::mac::IsOSLionOrLater();
@@ -1486,8 +1486,8 @@ bool RenderThreadImpl::IsZeroCopyEnabled() {
   return is_zero_copy_enabled_;
 }
 
-bool RenderThreadImpl::IsPersistentGpuMemoryBufferEnabled() {
-  return is_persistent_gpu_memory_buffer_enabled_;
+bool RenderThreadImpl::IsPartialRasterEnabled() {
+  return is_partial_raster_enabled_;
 }
 
 bool RenderThreadImpl::IsElasticOverscrollEnabled() {