Add gpu::MailboxHolder to hold state for a gpu::Mailbox

cc/test/layer_tree_pixel_test.cc

 // Copyright 2013 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/test/layer_tree_pixel_test.h"
 
 #include "base/command_line.h"
 #include "base/path_service.h"
 #include "cc/base/switches.h"
 #include "cc/layers/solid_color_layer.h"
@@ skipping 228 matching lines @@
   if (texture_mailbox.sync_point())
     gl->WaitSyncPointCHROMIUM(texture_mailbox.sync_point());
 
   GLuint texture_id = 0;
   gl->GenTextures(1, &texture_id);
   gl->BindTexture(GL_TEXTURE_2D, texture_id);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
   gl->TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  gl->ConsumeTextureCHROMIUM(texture_mailbox.target(), texture_mailbox.data());
+  gl->ConsumeTextureCHROMIUM(texture_mailbox.target(),
+                             texture_mailbox.mailbox().name);
   gl->BindTexture(GL_TEXTURE_2D, 0);
 
   GLuint fbo = 0;
   gl->GenFramebuffers(1, &fbo);
   gl->BindFramebuffer(GL_FRAMEBUFFER, fbo);
   gl->FramebufferTexture2D(
       GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texture_id, 0);
   EXPECT_EQ(static_cast<unsigned>(GL_FRAMEBUFFER_COMPLETE),
             gl->CheckFramebufferStatus(GL_FRAMEBUFFER));
 
@@ skipping 101 matching lines @@
                    GL_UNSIGNED_BYTE,
                    gl_pixels.get());
   }
 
   gpu::Mailbox mailbox;
   gl->GenMailboxCHROMIUM(mailbox.name);
   gl->ProduceTextureCHROMIUM(GL_TEXTURE_2D, mailbox.name);
   gl->BindTexture(GL_TEXTURE_2D, 0);
   uint32 sync_point = gl->InsertSyncPointCHROMIUM();
 
-  *texture_mailbox = TextureMailbox(mailbox, sync_point);
+  *texture_mailbox = TextureMailbox(mailbox, GL_TEXTURE_2D, sync_point);
   *release_callback = SingleReleaseCallback::Create(
       base::Bind(&LayerTreePixelTest::ReleaseTextureMailbox,
                  base::Unretained(this),
                  base::Passed(&context),
                  texture_id));
 }
 
 }  // namespace cc