Make invalidateFramebuffer no-op for DEPTH_STENCIL attachment

gpu/command_buffer/service/framebuffer_manager.h

Index: gpu/command_buffer/service/framebuffer_manager.h
diff --git a/gpu/command_buffer/service/framebuffer_manager.h b/gpu/command_buffer/service/framebuffer_manager.h
index 2337843f68ef929b447efbf1cb4c81f7a4658d44..cb6ef48db5568f9336af3782c78543fc15c5b697 100644
--- a/gpu/command_buffer/service/framebuffer_manager.h
+++ b/gpu/command_buffer/service/framebuffer_manager.h
@@ -41,11 +41,13 @@ class GPU_EXPORT Framebuffer : public base::RefCounted<Framebuffer> {
     virtual GLenum texture_type() const = 0;
     virtual GLsizei samples() const = 0;
     virtual GLuint object_name() const = 0;
+    virtual GLenum attachment() const = 0;
     virtual bool cleared() const = 0;
     virtual void SetCleared(
         RenderbufferManager* renderbuffer_manager,
         TextureManager* texture_manager,
         bool cleared) = 0;
+    virtual bool IsDepthStencil() const = 0;
     virtual bool IsPartiallyCleared() const = 0;
     virtual bool IsTextureAttachment() const = 0;
     virtual bool IsRenderbufferAttachment() const = 0;
@@ -84,6 +86,11 @@ class GPU_EXPORT Framebuffer : public base::RefCounted<Framebuffer> {
   bool HasUnclearedAttachment(GLenum attachment) const;
   bool HasUnclearedColorAttachments() const;
 
+  static bool IsDepthStencilFormat(GLenum internal_format) {
+    return internal_format == GL_DEPTH24_STENCIL8 ||
+           internal_format == GL_DEPTH32F_STENCIL8;
+  }
+
   bool HasSRGBAttachments() const;
 
   void ClearUnclearedIntOr3DTexturesOrPartiallyClearedTextures(