gpu, cmaa: improve |do_copy| condition logic

gpu/command_buffer/service/framebuffer_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/framebuffer_manager.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/logging.h"
@@ skipping 48 matching lines @@
                   TextureManager* /* texture_manager */,
                   bool cleared) override {
     DCHECK(renderbuffer_manager);
     renderbuffer_manager->SetCleared(renderbuffer_.get(), cleared);
   }
 
   bool IsPartiallyCleared() const override { return false; }
 
   bool IsTextureAttachment() const override { return false; }
   bool IsRenderbufferAttachment() const override { return true; }
+  bool IsTextureAttachmentImmutable() const override { return false; }
 
   bool IsTexture(TextureRef* /* texture */) const override { return false; }
 
   bool IsRenderbuffer(Renderbuffer* renderbuffer) const override {
     return renderbuffer_.get() == renderbuffer;
   }
 
   bool IsSameAttachment(const Attachment* attachment) const override {
     if (attachment->IsRenderbufferAttachment()) {
       const RenderbufferAttachment* other =
@@ skipping 119 matching lines @@
     texture_manager->SetLevelCleared(
         texture_ref_.get(), target_, level_, cleared);
   }
 
   bool IsPartiallyCleared() const override {
     return texture_ref_->texture()->IsLevelPartiallyCleared(target_, level_);
   }
 
   bool IsTextureAttachment() const override { return true; }
   bool IsRenderbufferAttachment() const override { return false; }
+  bool IsTextureAttachmentImmutable() const override {
+    return texture_ref_->texture()->IsImmutable();
+  }
 
   bool IsTexture(TextureRef* texture) const override {
     return texture == texture_ref_.get();
   }
 
   bool IsSameAttachment(const Attachment* attachment) const override {
     if (attachment->IsTextureAttachment()) {
       const TextureAttachment* other =
           reinterpret_cast<const TextureAttachment*>(attachment);
       return IsTexture(other->texture()) &&
@@ skipping 838 matching lines @@
 
 bool FramebufferManager::IsComplete(
     Framebuffer* framebuffer) {
   DCHECK(framebuffer);
   return framebuffer->framebuffer_complete_state_count_id() ==
       framebuffer_state_change_count_;
 }
 
 }  // namespace gles2
 }  // namespace gpu