Web Inspector: Add requestMetadata command and metadataReceived event to FileSystem

Web Inspector: Add requestMetadata command and metadataReceived event to FileSystem
https://bugs.webkit.org/show_bug.cgi?id=87856

Patch by Taiju Tsuiki <tzik@chromium.org> on 2012-06-26
Reviewed by Yury Semikhatsky.

Source/WebCore:

Test: http/tests/inspector/filesystem/get-metadata.html

* inspector/Inspector.json:
* inspector/InspectorFileSystemAgent.cpp:
(WebCore):
(WebCore::InspectorFileSystemAgent::requestFileSystemRoot):
(WebCore::InspectorFileSystemAgent::requestDirectoryContent):
(WebCore::InspectorFileSystemAgent::requestMetadata):
* inspector/InspectorFileSystemAgent.h:
(InspectorFileSystemAgent):
* inspector/front-end/FileSystemModel.js:
(WebInspector.FileSystemModel.prototype._directoryContentReceived):
(WebInspector.FileSystemModel.prototype.requestMetadata):
(WebInspector.FileSystemModel.Entry.prototype.get isDirectory):
(WebInspector.FileSystemModel.Entry.prototype.requestMetadata):
(WebInspector.FileSystemRequestManager):
(WebInspector.FileSystemRequestManager.prototype._directoryContentReceived):
(WebInspector.FileSystemRequestManager.prototype.requestMetadata.requestAccepted):
(WebInspector.FileSystemRequestManager.prototype.requestMetadata):
(WebInspector.FileSystemRequestManager.prototype._metadataReceived):
(WebInspector.FileSystemDispatcher.prototype.directoryContentReceived):
(WebInspector.FileSystemDispatcher.prototype.metadataReceived):

LayoutTests:

* http/tests/inspector/filesystem/filesystem-test.js:
(initialize_FileSystemTest.InspectorTest.writeFile):
(initialize_FileSystemTest.InspectorTest.dumpMetadataRequestResult):
(initialize_FileSystemTest):
(writeFile.didGetFileSystem):
(writeFile):
(writeFile.didGetWriter.writer.onwrite):
(writeFile.didGetWriter):
* http/tests/inspector/filesystem/get-metadata-expected.txt: Added.
* http/tests/inspector/filesystem/get-metadata.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121251 268f45cc-cd09-0410-ab3c-d52691b4dbfc