fileSystemProvider: First cut at implementing fileSystemProvider API

chrome/renderer/extensions/file_system_natives.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/file_system_natives.h"
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/renderer/extensions/chrome_v8_context.h"
 #include "chrome/renderer/extensions/user_script_slave.h"
 #include "extensions/common/constants.h"
 #include "grit/renderer_resources.h"
 #include "third_party/WebKit/public/platform/WebFileSystem.h"
 #include "third_party/WebKit/public/platform/WebFileSystemType.h"
 #include "third_party/WebKit/public/platform/WebString.h"
+#include "third_party/WebKit/public/web/WebDOMError.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "webkit/common/fileapi/file_system_types.h"
 #include "webkit/common/fileapi/file_system_util.h"
 
 namespace extensions {
 
 FileSystemNatives::FileSystemNatives(ChromeV8Context* context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction("GetFileEntry",
       base::Bind(&FileSystemNatives::GetFileEntry, base::Unretained(this)));
   RouteFunction("GetIsolatedFileSystem",
       base::Bind(&FileSystemNatives::GetIsolatedFileSystem,
                  base::Unretained(this)));
   RouteFunction("CrackIsolatedFileSystemName",
       base::Bind(&FileSystemNatives::CrackIsolatedFileSystemName,
                  base::Unretained(this)));
+  RouteFunction("GetDOMError",
+      base::Bind(&FileSystemNatives::GetDOMError,
+                 base::Unretained(this)));
 }
 
 void FileSystemNatives::GetIsolatedFileSystem(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   DCHECK(args.Length() == 1 || args.Length() == 2);
   DCHECK(args[0]->IsString());
   std::string file_system_id(*v8::String::Utf8Value(args[0]));
   blink::WebFrame* webframe =
       blink::WebFrame::frameForContext(context()->v8_context());
   DCHECK(webframe);
@@ skipping 65 matching lines @@
   DCHECK(args[0]->IsString());
   std::string filesystem_name = *v8::String::Utf8Value(args[0]->ToString());
   std::string filesystem_id;
   if (!fileapi::CrackIsolatedFileSystemName(filesystem_name, &filesystem_id))
     return;
 
   args.GetReturnValue().Set(
       v8::String::New(filesystem_id.c_str(), filesystem_id.size()));
 }
 
+void FileSystemNatives::GetDOMError(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  if (args.Length() != 2) {
+    NOTREACHED();
+    return;
+  }
+  if (!args[0]->IsString()) {
+    NOTREACHED();
+    return;
+  }
+  if (!args[1]->IsString()) {
+    NOTREACHED();
+    return;
+  }
+
+  std::string name(*v8::String::Utf8Value(args[0]));
+  if (name.empty()) {
+    NOTREACHED();
+    return;
+  }
+  std::string message(*v8::String::Utf8Value(args[1]));
+  // message is optional hence empty is fine.
+
+  blink::WebDOMError dom_error = blink::WebDOMError::create(
+      blink::WebString::fromUTF8(name),
+      blink::WebString::fromUTF8(message));
+  args.GetReturnValue().Set(dom_error.toV8Value());
+}
+
 }  // namespace extensions