Reland: Added SyncToken command buffer trait to help with IPC messages

gpu/command_buffer/tests/gl_fence_sync_unittest.cc

Index: gpu/command_buffer/tests/gl_fence_sync_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_fence_sync_unittest.cc b/gpu/command_buffer/tests/gl_fence_sync_unittest.cc
index ad21f345a870078e90dc59b20b75ba280883ee3c..2d764765e966a7f5339ecc63006c8adb9083c14e 100644
--- a/gpu/command_buffer/tests/gl_fence_sync_unittest.cc
+++ b/gpu/command_buffer/tests/gl_fence_sync_unittest.cc
@@ -7,6 +7,7 @@
 #include <GLES2/gl2extchromium.h>
 
 #include "base/memory/scoped_ptr.h"
+#include "gpu/command_buffer/common/sync_token.h"
 #include "gpu/command_buffer/service/sync_point_manager.h"
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
@@ -44,9 +45,9 @@ TEST_F(GLFenceSyncTest, SimpleReleaseWait) {
   gl1_.MakeCurrent();
 
   const GLuint64 fence_sync = glInsertFenceSyncCHROMIUM();
-  GLbyte sync_token[GL_SYNC_TOKEN_SIZE_CHROMIUM];
+  SyncToken sync_token;
   glFlush();
-  glGenSyncTokenCHROMIUM(fence_sync, sync_token);
+  glGenSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
   ASSERT_TRUE(GL_NO_ERROR == glGetError());
 
   // Make sure it is actually released.
@@ -56,7 +57,7 @@ TEST_F(GLFenceSyncTest, SimpleReleaseWait) {
   EXPECT_TRUE(gl1_client_state->IsFenceSyncReleased(fence_sync));
 
   gl2_.MakeCurrent();
-  glWaitSyncTokenCHROMIUM(sync_token);
+  glWaitSyncTokenCHROMIUM(sync_token.GetConstData());
   glFinish();
 
   // gl2 should not have released anything.