Web Inspector: Add requestFileContent command and fileContentReceived event

Web Inspector: Add requestFileContent command and fileContentReceived event
https://bugs.webkit.org/show_bug.cgi?id=89642

Patch by Taiju Tsuiki <tzik@chromium.org> on 2012-07-02
Reviewed by Vsevolod Vlasov.

Source/WebCore:

Test: http/tests/inspector/filesystem/read-file.html

* inspector/Inspector.json:
* inspector/InspectorFileSystemAgent.cpp:
(WebCore):
(WebCore::InspectorFileSystemAgent::requestFileContent):
* inspector/InspectorFileSystemAgent.h:
(InspectorFileSystemAgent):
* inspector/front-end/FileSystemModel.js:
(WebInspector.FileSystemModel.prototype.requestMetadata):
(WebInspector.FileSystemModel.prototype.requestFileContent):
(WebInspector.FileSystemModel.File.prototype.get resourceType):
(WebInspector.FileSystemModel.File.prototype.requestFileContent):
(WebInspector.FileSystemRequestManager):
(WebInspector.FileSystemRequestManager.prototype._metadataReceived):
(WebInspector.FileSystemRequestManager.prototype.requestFileContent.requestAccepted):
(WebInspector.FileSystemRequestManager.prototype.requestFileContent):
(WebInspector.FileSystemRequestManager.prototype._fileContentReceived):
(WebInspector.FileSystemDispatcher.prototype.metadataReceived):
(WebInspector.FileSystemDispatcher.prototype.fileContentReceived):

LayoutTests:

* http/tests/inspector/filesystem/read-file-expected.txt: Added.
* http/tests/inspector/filesystem/read-file.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@121676 268f45cc-cd09-0410-ab3c-d52691b4dbfc