DevTools: improve DevTools file watcher to send added and removed paths

third_party/WebKit/Source/devtools/front_end/devtools.js

Index: third_party/WebKit/Source/devtools/front_end/devtools.js
diff --git a/third_party/WebKit/Source/devtools/front_end/devtools.js b/third_party/WebKit/Source/devtools/front_end/devtools.js
index a56b6486b488e0d7f7db73a71e1a00d5af838bcd..ebf3f82344fa074636cc24af0d8438c56a1254db 100644
--- a/third_party/WebKit/Source/devtools/front_end/devtools.js
+++ b/third_party/WebKit/Source/devtools/front_end/devtools.js
@@ -194,9 +194,9 @@ DevToolsAPIImpl.prototype = {
         this._dispatchOnInspectorFrontendAPI("fileSystemAdded", ["", fileSystem]);
     },
 
-    fileSystemFilesChanged: function(path)
+    fileSystemFilesChanged: function(changedPaths, addedPaths, removedPaths)

[dgozman, 2016/10/04 00:17:02]

Let's add JSDoc.

[lushnikov, 2016/10/04 01:04:18]

Done.

     {
-        this._dispatchOnInspectorFrontendAPI("fileSystemFilesChanged", [path]);
+        this._dispatchOnInspectorFrontendAPI("fileSystemFilesChanged", [changedPaths, addedPaths, removedPaths]);

[dgozman, 2016/10/04 00:17:02]

I'd rename the method to fileSystemPathsChanged to avoid confusion with old one,
and add the following code to this place. Everything else should work with new
method name.

// Support for legacy (<M55) frontends.
var api = window["InspectorFrontendAPI"];
if (api["fileSystemPathsChanged"])
    api["fileSystemPathsChanged"].call(api, changedPaths, addedPaths,
removedPaths)
else
    api["fileSystemFilesChanged"].call(api, <concat all paths>);

[lushnikov, 2016/10/04 01:04:18]

Nice, thanks!

As per offline discussion, I've refrained from changing API for now altogether.

     },
 
     /**