gpu: Generate mailboxes on client side

gpu/command_buffer/tests/gl_texture_mailbox_unittest.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 <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
 #include "gpu/command_buffer/client/gles2_lib.h"
 #include "gpu/command_buffer/common/mailbox.h"
@@ skipping 112 matching lines @@
                0,
                GL_RGBA,
                1, 1,
                0,
                GL_RGBA,
                GL_UNSIGNED_BYTE,
                &source_pixel);
 
   GLbyte invalid_mailbox[GL_MAILBOX_SIZE_CHROMIUM];
   glGenMailboxCHROMIUM(invalid_mailbox);
-  ++invalid_mailbox[GL_MAILBOX_SIZE_CHROMIUM - 1];
 
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   glConsumeTextureCHROMIUM(GL_TEXTURE_2D, invalid_mailbox);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_OPERATION), glGetError());
 
   // Ensure level 0 is still intact after glConsumeTextureCHROMIUM fails.
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   EXPECT_EQ(source_pixel, ReadTexel(tex, 0, 0));
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
 }
@@ skipping 192 matching lines @@
     other_gl[i].Destroy();
   }
 
   gl1_.MakeCurrent();
   glDeleteTextures(2, tex);
 }
 #endif
 
 }  // namespace gpu