Added a way for sync point clients to issue out of order waits.

gpu/command_buffer/tests/gl_fence_sync_unittest.cc

 // Copyright 2015 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 "base/memory/scoped_ptr.h"
 #include "gpu/command_buffer/common/sync_token.h"
@@ skipping 49 matching lines @@
   glWaitSyncTokenCHROMIUM(sync_token.GetConstData());
   glFinish();
 
   // gl2 should not have released anything.
   scoped_refptr<SyncPointClientState> gl2_client_state =
       sync_point_manager_->GetSyncPointClientState(gl2_.GetNamespaceID(),
                                                    gl2_.GetCommandBufferID());
   EXPECT_EQ(0u, gl2_client_state->fence_sync_release());
 }
 
+static void TestCallback(int* storage, int assign) {
+  *storage = assign;
+}
+
+TEST_F(GLFenceSyncTest, SimpleReleaseSignal) {
+  gl1_.MakeCurrent();
+
+  // Pause the command buffer so the fence sync does not immediately trigger.
+  gl1_.SetCommandsPaused(true);
+
+  const GLuint64 fence_sync = glInsertFenceSyncCHROMIUM();
+  SyncToken sync_token;
+  glGenUnverifiedSyncTokenCHROMIUM(fence_sync, sync_token.GetData());
+  glFlush();
+  ASSERT_TRUE(sync_token.HasData());
+
+  gl2_.MakeCurrent();
+  int callback_called = 0;
+  gl2_.SignalSyncToken(sync_token,
+                       base::Bind(TestCallback, &callback_called, 1));
+
+  gl1_.MakeCurrent();
+  EXPECT_EQ(0, callback_called);
+
+  gl1_.SetCommandsPaused(false);
+  glFinish();
+
+  EXPECT_EQ(1, callback_called);
+}
+
 }  // namespace gpu