[instrumentation] Generalize instrumentation to be used beyond the core layer

third_party/WebKit/Source/platform/instrumentation/PlatformInstrumentation.h

-/*
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+// Copyright 2017 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.
 
 #ifndef PlatformInstrumentation_h
 #define PlatformInstrumentation_h
 
 #include "platform/PlatformExport.h"
 #include "platform/instrumentation/tracing/TraceEvent.h"
-#include "wtf/text/WTFString.h"
+#include "platform/loader/fetch/FetchContext.h"
 
 namespace blink {
 
+class FetchContext;
+class PlatformInstrumentationAgents;
+
+namespace probe {
+
+class PLATFORM_EXPORT ProbeBase {
+  STACK_ALLOCATED()
+
+ public:
+  double captureStartTime() const;
+  double captureEndTime() const;
+  double duration() const;
+
+ private:
+  mutable double m_startTime = 0;
+  mutable double m_endTime = 0;
+};
+
+inline PlatformInstrumentationAgents* instrumentingAgentsFor(
+    FetchContext* context) {
+  return context->instrumentingAgents();
+}
+
+}  // namespace probe
+
 class PLATFORM_EXPORT PlatformInstrumentation {
  public:
   class LazyPixelRefTracker : TraceEvent::TraceScopedTrackableObject<void*> {
    public:
     LazyPixelRefTracker(void* instance)
         : TraceEvent::TraceScopedTrackableObject<void*>(CategoryName,
                                                         LazyPixelRef,
                                                         instance) {}
   };
 
@@ skipping 37 matching lines @@
   TRACE_EVENT_BEGIN1(CategoryName, DecodeLazyPixelRefEvent, LazyPixelRef,
                      lazyPixelRefId);
 }
 
 inline void PlatformInstrumentation::didDecodeLazyPixelRef() {
   TRACE_EVENT_END0(CategoryName, DecodeLazyPixelRefEvent);
 }
 
 }  // namespace blink
 
+#include "platform/PlatformInstrumentationInl.h"
+
 #endif  // PlatformInstrumentation_h