Pass command line arguments onto platform apps which provide the right intent.

chrome/renderer/extensions/experimental.app_custom_bindings.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/renderer/extensions/experimental.app_custom_bindings.h"
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/logging.h"
+#include "chrome/renderer/extensions/user_script_slave.h"
+#include "grit/renderer_resources.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebFileSystem.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
+#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
+
+namespace {
+
+static v8::Handle<v8::Value> GetIsolatedFileSystem(
+    const v8::Arguments& args) {
+  DCHECK(args.Length() == 1);
+  DCHECK(args[0]->IsString());
+  std::string file_system_id(*v8::String::Utf8Value(args[0]));
+  WebKit::WebFrame* webframe = WebKit::WebFrame::frameForCurrentContext();
+  DCHECK(webframe);
+
+  GURL context_url = UserScriptSlave::GetDataSourceURLForFrame(webframe);

[Mihai Parparita -not on Chrome, 2012/05/18 04:26:04]

Might be safe to add a CHECK that this is an extension URL.

[benwells, 2012/05/22 13:15:03]

Done.

+  std::string name = context_url.GetOrigin().spec();
+  name.append("isolated/");

[Mihai Parparita -not on Chrome, 2012/05/18 04:26:04]

Seems like you can use GetFileSystemRootURI(context_url,
kFileSystemTypeIsolated) would help you construct these URLs

[benwells, 2012/05/18 04:56:55]

That isn't implemented for isolated file systems, I think intentionally as the
URL syntax is not exposed. Kinuko - is that correct?

[kinuko, 2012/05/18 10:22:17]

It was correct, but I just added the minimal support in the fileapi code as
seeing a constant string like "isolated" here doesn't feel right.

Can you use fileapi::GetFileSystemRootURI() and fileapi::GetFileSystemName() for
the common part, and just append |file_system_id| at the end of the returned
value?

[benwells, 2012/05/22 13:15:03]

Nice! Done.

+  name.append(file_system_id);
+
+  std::string root;
+  root.append("filesystem:");
+  root.append(context_url.GetOrigin().spec());
+  root.append("isolated/");
+  root.append(file_system_id);
+  root.append("/");
+
+  return webframe->createFileSystem(
+      WebKit::WebFileSystem::TypeIsolated,
+      WebKit::WebString::fromUTF8(name.c_str()),
+      WebKit::WebString::fromUTF8(root.c_str()));
+}
+
+}  // namespace
+
+namespace extensions {
+
+ExperimentalAppCustomBindings::ExperimentalAppCustomBindings()
+    : ChromeV8Extension(NULL) {
+  RouteStaticFunction("GetIsolatedFileSystem", &GetIsolatedFileSystem);
+}
+
+}  // namespace extensions