cc: Make one-copy tile initialization mechanism use immutable textures.

cc/resources/resource_provider.cc

 // Copyright 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 "cc/resources/resource_provider.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/containers/hash_tables.h"
@@ skipping 2059 matching lines @@
   DCHECK_EQ(GLTexture, source_resource->type);
   DCHECK(source_resource->allocated);
   LazyCreate(source_resource);
 
   Resource* dest_resource = GetResource(dest_id);
   DCHECK(!dest_resource->locked_for_write);
   DCHECK(!dest_resource->lock_for_read_count);
   DCHECK(dest_resource->origin == Resource::Internal);
   DCHECK_EQ(dest_resource->exported_count, 0);
   DCHECK_EQ(GLTexture, dest_resource->type);
-  LazyCreate(dest_resource);
+  LazyAllocate(dest_resource);

[dshwang, 2014/11/20 16:58:39]

It doesn't regress perf because CopyTextureChromium calls glTexImage2D if the
compositor doesn't allocate the dest texture.
See
https://code.google.com/p/chromium/codesearch#chromium/src/gpu/command_buffer...

 
   DCHECK_EQ(source_resource->type, dest_resource->type);
   DCHECK_EQ(source_resource->format, dest_resource->format);
   DCHECK(source_resource->size == dest_resource->size);
 
   GLES2Interface* gl = ContextGL();
   DCHECK(gl);
   if (source_resource->image_id && source_resource->dirty_image) {
     gl->BindTexture(source_resource->target, source_resource->gl_id);
     BindImageForSampling(source_resource);
@@ skipping 64 matching lines @@
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->ContextGL() : NULL;
 }
 
 class GrContext* ResourceProvider::GrContext() const {
   ContextProvider* context_provider = output_surface_->context_provider();
   return context_provider ? context_provider->GrContext() : NULL;
 }
 
 }  // namespace cc