Remove some unnecessary code from BackTexture::Create.

gpu/command_buffer/service/gles2_cmd_decoder.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/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 2416 matching lines @@
 }
 
 BackTexture::~BackTexture() {
   // This does not destroy the render texture because that would require that
   // the associated GL context was current. Just check that it was explicitly
   // destroyed.
   DCHECK_EQ(id_, 0u);
 }
 
 void BackTexture::Create() {
+  DCHECK_EQ(id_, 0u);
   ScopedGLErrorSuppressor suppressor("BackTexture::Create",
                                      state_->GetErrorState());
-  Destroy();
   glGenTextures(1, &id_);
   ScopedTextureBinder binder(state_, id_, GL_TEXTURE_2D);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-
-  // TODO(apatrick): Attempt to diagnose crbug.com/97775. If SwapBuffers is
-  // never called on an offscreen context, no data will ever be uploaded to the
-  // saved offscreen color texture (it is deferred until to when SwapBuffers
-  // is called). My idea is that some nvidia drivers might have a bug where
-  // deleting a texture that has never been populated might cause a
-  // crash.
-  glTexImage2D(
-      GL_TEXTURE_2D, 0, GL_RGBA, 16, 16, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
-
-  bytes_allocated_ = 16u * 16u * 4u;
-  memory_tracker_.TrackMemAlloc(bytes_allocated_);
 }
 
 bool BackTexture::AllocateStorage(
     const gfx::Size& size, GLenum format, bool zero) {
   DCHECK_NE(id_, 0u);
   ScopedGLErrorSuppressor suppressor("BackTexture::AllocateStorage",
                                      state_->GetErrorState());
   ScopedTextureBinder binder(state_, id_, GL_TEXTURE_2D);
   uint32_t image_size = 0;
   GLES2Util::ComputeImageDataSizes(
@@ skipping 14558 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu