DevTools: Async call stacks for FileSystem API part 2.

Source/core/fileapi/FileReader.cpp

Index: Source/core/fileapi/FileReader.cpp
diff --git a/Source/core/fileapi/FileReader.cpp b/Source/core/fileapi/FileReader.cpp
index ae7ba388a963c9dd6a840e35fe056cbb238cc421..36361c26914f2c8b0ec7203419fd548a6c00028d 100644
--- a/Source/core/fileapi/FileReader.cpp
+++ b/Source/core/fileapi/FileReader.cpp
@@ -39,6 +39,7 @@
 #include "core/events/ProgressEvent.h"
 #include "core/fileapi/File.h"
 #include "core/frame/LocalFrame.h"
+#include "core/inspector/InspectorInstrumentation.h"
 #include "core/workers/WorkerClients.h"
 #include "core/workers/WorkerGlobalScope.h"
 #include "platform/Logging.h"
@@ -118,6 +119,7 @@ public:
         if (!controller)
             return;
 
+        reader->m_asyncOperationId = InspectorInstrumentation::traceAsyncOperationStarting(context, "FileReader");
         controller->pushReader(reader);
     }
 
@@ -132,6 +134,8 @@ public:
 
     static void finishReader(ExecutionContext* context, FileReader* reader, FinishReaderType nextStep)
     {
+        InspectorInstrumentation::traceAsyncOperationCompleted(context, reader->m_asyncOperationId);
+
         ThrottlingController* controller = from(context);
         if (!controller)
             return;
@@ -222,6 +226,7 @@ FileReader::FileReader(ExecutionContext* context)
     , m_loadingState(LoadingStateNone)
     , m_readType(FileReaderLoader::ReadAsBinaryString)
     , m_lastProgressNotificationTimeMS(0)
+    , m_asyncOperationId(0)
 {
     ScriptWrappable::init(this);
 }
@@ -460,8 +465,10 @@ void FileReader::didFail(FileError::ErrorCode errorCode)
 
 void FileReader::fireEvent(const AtomicString& type)
 {
+    InspectorInstrumentationCookie cookie = InspectorInstrumentation::traceAsyncCallbackStarting(executionContext(), m_asyncOperationId);
     if (!m_loader) {
         dispatchEvent(ProgressEvent::create(type, false, 0, 0));
+        InspectorInstrumentation::traceAsyncCallbackCompleted(cookie);
         return;
     }
 
@@ -469,6 +476,8 @@ void FileReader::fireEvent(const AtomicString& type)
         dispatchEvent(ProgressEvent::create(type, true, m_loader->bytesLoaded(), m_loader->totalBytes()));
     else
         dispatchEvent(ProgressEvent::create(type, false, m_loader->bytesLoaded(), 0));
+
+    InspectorInstrumentation::traceAsyncCallbackCompleted(cookie);
 }
 
 PassRefPtr<ArrayBuffer> FileReader::arrayBufferResult() const