Add PERSISTENT_MAP usage for GpuMemoryBuffers.

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 bb9e409d7024de96fb77b1aafc2828dc972909d6..7eb7dddfdf77290559170cb0f0616431cdbe628f 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -592,11 +592,19 @@ void RenderThreadImpl::Init() {
   is_elastic_overscroll_enabled_ = false;
 #endif
 
-  std::string image_texture_target_string =
-      command_line.GetSwitchValueASCII(switches::kUseImageTextureTarget);
-  bool parsed_image_texture_target = base::StringToUint(
-      image_texture_target_string, &use_image_texture_target_);
-  DCHECK(parsed_image_texture_target);
+  std::string map_image_texture_target_string =
+      command_line.GetSwitchValueASCII(switches::kMapImageTextureTarget);
+  bool parsed_map_image_texture_target = base::StringToUint(
+      map_image_texture_target_string, &map_image_texture_target_);
+  DCHECK(parsed_map_image_texture_target);
+
+  std::string persistent_map_image_texture_target_string =
+      command_line.GetSwitchValueASCII(
+          switches::kPersistentMapImageTextureTarget);
+  bool parsed_persistent_map_image_texture_target =
+      base::StringToUint(persistent_map_image_texture_target_string,
+                         &persistent_map_image_texture_target_);
+  DCHECK(parsed_persistent_map_image_texture_target);
 
   if (command_line.HasSwitch(switches::kDisableLCDText)) {
     is_lcd_text_enabled_ = false;
@@ -1420,8 +1428,12 @@ bool RenderThreadImpl::UseSingleThreadScheduler() {
   return !layout_test_mode_;
 }
 
-uint32 RenderThreadImpl::GetImageTextureTarget() {
-  return use_image_texture_target_;
+uint32 RenderThreadImpl::GetMapImageTextureTarget() {
+  return map_image_texture_target_;
+}
+
+uint32 RenderThreadImpl::GetPersistentMapImageTextureTarget() {
+  return persistent_map_image_texture_target_;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>