During image destroy, delete textures only if we have a GL context.

gpu/command_buffer/service/gles2_cmd_decoder_unittest_textures.cc

 // Copyright 2014 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 "base/command_line.h"
 #include "base/strings/string_number_conversions.h"
 #include "gpu/command_buffer/common/gles2_cmd_format.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
@@ skipping 2257 matching lines @@
   EXPECT_TRUE(texture->GetLevelSize(GL_TEXTURE_2D, 0, &width, &height));
   // Image should no longer be set.
   EXPECT_TRUE(texture->GetLevelImage(GL_TEXTURE_2D, 0) == NULL);
 }
 
 class MockGLImage : public gfx::GLImage {
  public:
   MockGLImage() {}
 
   // Overridden from gfx::GLImage:
-  MOCK_METHOD0(Destroy, void());
   MOCK_METHOD0(GetSize, gfx::Size());
+  MOCK_METHOD1(Destroy, void(bool));
   MOCK_METHOD1(BindTexImage, bool(unsigned));
   MOCK_METHOD1(ReleaseTexImage, void(unsigned));
   MOCK_METHOD0(WillUseTexImage, void());
   MOCK_METHOD0(DidUseTexImage, void());
   MOCK_METHOD0(WillModifyTexImage, void());
   MOCK_METHOD0(DidModifyTexImage, void());
 
  protected:
   virtual ~MockGLImage() {}
 };
@@ skipping 537 matching lines @@
 // TODO(gman): CompressedTexSubImage2DImmediate
 
 // TODO(gman): TexImage2D
 
 // TODO(gman): TexImage2DImmediate
 
 // TODO(gman): TexSubImage2DImmediate
 
 }  // namespace gles2
 }  // namespace gpu