Reduce GPU mailbox size to 16 bytes

cc/ipc/cc_param_traits_unittest.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 <stddef.h>
 #include <string.h>
 #include <algorithm>
 #include <utility>
 
 #include "base/macros.h"
@@ skipping 545 matching lines @@
   gpu::SyncToken arbitrary_token1(gpu::CommandBufferNamespace::GPU_IO, 0,
                                   gpu::CommandBufferId::FromUnsafeValue(0x123),
                                   71234838);
   arbitrary_token1.SetVerifyFlush();
   gpu::SyncToken arbitrary_token2(gpu::CommandBufferNamespace::GPU_IO, 0,
                                   gpu::CommandBufferId::FromUnsafeValue(0x123),
                                   53589793);
   arbitrary_token2.SetVerifyFlush();
 
   GLbyte arbitrary_mailbox1[GL_MAILBOX_SIZE_CHROMIUM] = {
-      1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2,
-      3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4,
-      5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4};
+      1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6};
 
   GLbyte arbitrary_mailbox2[GL_MAILBOX_SIZE_CHROMIUM] = {
-      0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 7, 5, 3, 1, 2, 4, 6, 8, 0, 0, 9,
-      8, 7, 6, 5, 4, 3, 2, 1, 9, 7, 5, 3, 1, 2, 4, 6, 8, 0, 0, 9, 8, 7,
-      6, 5, 4, 3, 2, 1, 9, 7, 5, 3, 1, 2, 4, 6, 8, 0, 0, 9, 8, 7};
+      0, 9, 8, 7, 6, 5, 4, 3, 2, 1, 9, 7, 5, 3, 1, 2};
 
   TransferableResource arbitrary_resource1;
   arbitrary_resource1.id = 2178312;
   arbitrary_resource1.format = cc::RGBA_8888;
   arbitrary_resource1.filter = 53;
   arbitrary_resource1.size = gfx::Size(37189, 123123);
   arbitrary_resource1.mailbox_holder.mailbox.SetName(arbitrary_mailbox1);
   arbitrary_resource1.mailbox_holder.texture_target = GL_TEXTURE_2D;
   arbitrary_resource1.mailbox_holder.sync_token = arbitrary_token1;
   arbitrary_resource1.is_overlay_candidate = true;
@@ skipping 24 matching lines @@
   EXPECT_TRUE(
       IPC::ParamTraits<DelegatedFrameData>::Read(&msg, &iter, &frame_out));
 
   ASSERT_EQ(2u, frame_out.resource_list.size());
   Compare(arbitrary_resource1, frame_out.resource_list[0]);
   Compare(arbitrary_resource2, frame_out.resource_list[1]);
 }
 
 }  // namespace
 }  // namespace content