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

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

Index: third_party/WebKit/Source/platform/instrumentation/PlatformInstrumentation.h
diff --git a/third_party/WebKit/Source/platform/PlatformInstrumentation.h b/third_party/WebKit/Source/platform/instrumentation/PlatformInstrumentation.h
similarity index 57%
rename from third_party/WebKit/Source/platform/PlatformInstrumentation.h
rename to third_party/WebKit/Source/platform/instrumentation/PlatformInstrumentation.h
index 239c36727c2f379b4b8483acc8fae4e042c0cd08..a6f1e25dd084360bdfc9e81a7d368231d57a5ddb 100644
--- a/third_party/WebKit/Source/platform/PlatformInstrumentation.h
+++ b/third_party/WebKit/Source/platform/instrumentation/PlatformInstrumentation.h
@@ -1,42 +1,41 @@
-/*
- * 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
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
+// 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*> {
@@ -94,4 +93,6 @@ inline void PlatformInstrumentation::didDecodeLazyPixelRef() {
 
 }  // namespace blink
 
+#include "platform/PlatformInstrumentationInl.h"
+
 #endif  // PlatformInstrumentation_h