Remove unused trace sampling states

sky/engine/public/platform/Platform.h

 /*
  * Copyright (C) 2012 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 216 matching lines @@
 
     // Get a pointer to the enabled state of the given trace category. The
     // embedder can dynamically change the enabled state as trace event
     // recording is started and stopped by the application. Only long-lived
     // literal strings should be given as the category name. The implementation
     // expects the returned pointer to be held permanently in a local static. If
     // the unsigned char is non-zero, tracing is enabled. If tracing is enabled,
     // addTraceEvent is expected to be called by the trace event macros.
     virtual const unsigned char* getTraceCategoryEnabledFlag(const char* categoryName) { return 0; }
 
-    typedef long int TraceEventAPIAtomicWord;
-
-    // Get a pointer to a global state of the given thread. An embedder is
-    // expected to update the global state as the state of the embedder changes.
-    // A sampling thread in the Chromium side reads the global state periodically
-    // and reflects the sampling profiled results into about:tracing.
-    virtual TraceEventAPIAtomicWord* getTraceSamplingState(const unsigned bucketName) { return 0; }
-
     typedef uint64_t TraceEventHandle;
 
     // Add a trace event to the platform tracing system. Depending on the actual
     // enabled state, this event may be recorded or dropped.
     // - phase specifies the type of event:
     //   - BEGIN ('B'): Marks the beginning of a scoped event.
     //   - END ('E'): Marks the end of a scoped event.
     //   - COMPLETE ('X'): Marks the beginning of a scoped event, but doesn't
     //     need a matching END event. Instead, at the end of the scope,
     //     updateTraceEventDuration() must be called with the TraceEventHandle
@@ skipping 90 matching lines @@
     // This value must be checked again after a context loss event as the platform's capabilities may have changed.
     virtual bool canAccelerate2dCanvas() { return false; }
 
 protected:
     virtual ~Platform() { }
 };
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_PLATFORM_PLATFORM_H_