DevTools: expose setLayerTreeId() so we can relate events from LayerTreeHost

Source/core/inspector/InspectorInstrumentation.h

 /*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 133 matching lines @@
 }  // namespace InspectorInstrumentation
 
 namespace InstrumentationEvents {
 extern const char PaintSetup[];
 extern const char PaintLayer[];
 extern const char RasterTask[];
 extern const char ImageDecodeTask[];
 extern const char Paint[];
 extern const char Layer[];
 extern const char BeginFrame[];
+extern const char UpdateLayer[];
 };
 
 namespace InstrumentationEventArguments {
 extern const char LayerId[];
+extern const char LayerTreeId[];
+extern const char NodeId[];
 extern const char PageId[];
-extern const char NodeId[];
 };
 
 namespace InspectorInstrumentation {
 
 inline InstrumentingAgents* instrumentingAgentsForScriptExecutionContext(ScriptExecutionContext* context)
 {
     if (!context)
         return 0;
     if (context->isDocument())
         return instrumentingAgentsForPage(toDocument(context)->page());
@@ skipping 34 matching lines @@
 } // namespace WebCore
 
 // This file will soon be generated
 #include "InspectorInstrumentationInl.h"
 
 #include "InspectorInstrumentationCustomInl.h"
 
 #include "InspectorOverridesInl.h"
 
 #endif // !defined(InspectorInstrumentation_h)