DevTools: Support async call stacks for FileSystem API (part 1).

Source/core/inspector/InspectorInstrumentation.idl

Index: Source/core/inspector/InspectorInstrumentation.idl
diff --git a/Source/core/inspector/InspectorInstrumentation.idl b/Source/core/inspector/InspectorInstrumentation.idl
index a342ed6c17abc0e323907757a616bcda1298bde4..2a245525327b542013fb6edef6e6f7e09aaa7e04 100644
--- a/Source/core/inspector/InspectorInstrumentation.idl
+++ b/Source/core/inspector/InspectorInstrumentation.idl
@@ -52,7 +52,7 @@
 *       Keep - pass first parameter (used to access the InstrumentingAgents instance) to agents.
 *       FastReturn - return early from the inline method if this parameter is 0/false.
 *
-*   returnValue: C++ return value. Only "void" and "InspectorInstrumentationCookie" are supported.
+*   returnValue: C++ return value. Only "void", "bool" and "InspectorInstrumentationCookie" are supported.
 *
 *   methodName: C++ name for the public instrumentation method and agents methods.
 *
@@ -67,6 +67,9 @@ interface InspectorInstrumentation {
 
 #include "core/dom/PseudoElement.h"
 
+// Forward declarations.
+class AsyncFileSystemCallbacks;
+
     [Page, Inspector, PageDebugger, PageRuntime]
     void didClearDocumentOfWindowObject([Keep] LocalFrame*);
 
@@ -202,6 +205,18 @@ interface InspectorInstrumentation {
     [Debugger, Inline=FastReturn]
     void didPerformExecutionContextTask(ExecutionContext*);
 
+    [Debugger, Inline=FastReturn]
+    void didEnqueueAsyncFileSystemCallback([Keep] ExecutionContext*, AsyncFileSystemCallbacks*);
+
+    [Debugger, Inline=FastReturn]
+    void didRemoveAsyncFileSystemCallback([Keep] ExecutionContext*, AsyncFileSystemCallbacks*);
+
+    [Debugger, Inline=FastReturn]
+    void willHandleAsyncFileSystemCallback([Keep] ExecutionContext*, AsyncFileSystemCallbacks*, bool willReschedule, bool hasMore);
+
+    [Debugger, Inline=FastReturn]
+    void didHandleAsyncFileSystemCallback([Keep] ExecutionContext*, AsyncFileSystemCallbacks*, bool didReschedule);
+
     [Timeline, Inline=FastReturn]
     InspectorInstrumentationCookie willEvaluateScript([Keep] LocalFrame*, const String& url, int lineNumber);