[Worklets] Add basic debugging to main thread worklets.

third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h

Index: third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h
diff --git a/third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h b/third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h
index 2546c2ff46d988280b927099cd34ee0d897ab579..e57f6309f1373ef0aaa9e77ca91167689867e51f 100644
--- a/third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h
+++ b/third_party/WebKit/Source/modules/worklet/WorkletGlobalScope.h
@@ -10,8 +10,8 @@
 #include "core/dom/ExecutionContext.h"
 #include "core/dom/ExecutionContextTask.h"
 #include "core/dom/SecurityContext.h"
-#include "core/frame/LocalFrameLifecycleObserver.h"
 #include "core/inspector/ConsoleMessage.h"
+#include "core/workers/MainThreadWorkletGlobalScope.h"
 #include "core/workers/WorkerOrWorkletGlobalScope.h"
 #include "platform/heap/Handle.h"
 
@@ -22,7 +22,7 @@ class LocalFrame;
 class WorkerOrWorkletScriptController;
 class WorkletConsole;
 
-class WorkletGlobalScope : public RefCountedWillBeGarbageCollectedFinalized<WorkletGlobalScope>, public SecurityContext, public WorkerOrWorkletGlobalScope, public ScriptWrappable, public LocalFrameLifecycleObserver {
+class WorkletGlobalScope : public RefCountedWillBeGarbageCollectedFinalized<WorkletGlobalScope>, public SecurityContext, public MainThreadWorkletGlobalScope, public ScriptWrappable {

[pfeldman, 2016/03/11 22:34:24]

This sounds misleading: workers are actually running on their threads.

[ikilpatrick, 2016/03/11 23:37:09]

Sorry I'm not sure I understand? All worklets at the moment are running on the
MainThread. We'll eventually add versions which run on different threads (for
audio & compositor).

[pfeldman, 2016/03/15 00:34:56]

My bad. I read it as "WorkerGlobalScope" inheriting from MainThread.

     DEFINE_WRAPPERTYPEINFO();
     WILL_BE_USING_GARBAGE_COLLECTED_MIXIN(WorkletGlobalScope);
 public: