Make invalidateFramebuffer no-op for DEPTH_STENCIL attachment

gpu/command_buffer/service/texture_manager.h

Index: gpu/command_buffer/service/texture_manager.h
diff --git a/gpu/command_buffer/service/texture_manager.h b/gpu/command_buffer/service/texture_manager.h
index 0c74c4b85057e97ac057420b9503bb45c1bb9ec4..46f20bd047d0d3ae293f15cf531ae3ce7f936d9f 100644
--- a/gpu/command_buffer/service/texture_manager.h
+++ b/gpu/command_buffer/service/texture_manager.h
@@ -261,6 +261,11 @@ class GPU_EXPORT Texture {
 
   // Whether a particular level/face is cleared.
   bool IsLevelCleared(GLenum target, GLint level) const;
+
+  // Only meaningful when the format is DEPTH_STENCIL.
+  // Whether a particular part is cleared.
+  bool IsLevelCleared(GLenum target, GLint level, GLenum attachment) const;
+
   // Whether a particular level/face is partially cleared.
   bool IsLevelPartiallyCleared(GLenum target, GLint level) const;
 
@@ -395,6 +400,13 @@ class GPU_EXPORT Texture {
   // Marks a particular level as cleared or uncleared.
   void SetLevelCleared(GLenum target, GLint level, bool cleared);
 
+  // Only meaningful when the format is DEPTH_STENCIL.
+  // Marks a particular part as cleared or uncleared.
+  void SetLevelCleared(GLenum target,
+                       GLint level,
+                       GLenum attachment,
+                       bool cleared);
+
   // Updates the cleared flag for this texture by inspecting all the mips.
   void UpdateCleared();
 
@@ -553,6 +565,12 @@ class GPU_EXPORT Texture {
   // Whether all renderable mips of this texture have been cleared.
   bool cleared_;
 
+  // Only meaningful when format is DEPTH_STENCIL.
+  // Whether the depth part of the texture have been cleared.
+  bool depth_cleared_;
+  // Whether the stencil part of the texture have been cleared.
+  bool stencil_cleared_ ;
+
   int num_uncleared_mips_;
   int num_npot_faces_;
 
@@ -848,6 +866,11 @@ class GPU_EXPORT TextureManager : public base::trace_event::MemoryDumpProvider {
   void SetLevelCleared(TextureRef* ref, GLenum target,
                        GLint level, bool cleared);
 
+  // Only meaningful when the internal format is DEPTH_STENCIL.
+  // Sets the particular part of the texture as cleared or uncleared.
+  void SetLevelCleared(TextureRef* ref, GLenum target,
+                       GLint level, GLenum attachment, bool cleared);
+
   // Sets a texture parameter of a Texture
   // Returns GL_NO_ERROR on success. Otherwise the error to generate.
   // TODO(gman): Expand to SetParameteriv,fv