Lazy load chrome.* APIs

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/user_script_slave.h"
 #include "extensions/common/constants.h"
 #include "grit/renderer_resources.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebFileSystem.h"
 #include "third_party/WebKit/Source/Platform/chromium/public/WebString.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
 #include "webkit/fileapi/file_system_types.h"
 #include "webkit/fileapi/file_system_util.h"
 
-namespace {
+namespace extensions {
 
-static v8::Handle<v8::Value> GetIsolatedFileSystem(
+FileSystemNatives::FileSystemNatives(v8::Handle<v8::Context> context)
+    : ObjectBackedNativeHandler(context) {
+  RouteFunction("GetFileEntry",
+      base::Bind(&FileSystemNatives::GetFileEntry, base::Unretained(this)));
+  RouteFunction("GetIsolatedFileSystem",
+      base::Bind(&FileSystemNatives::GetIsolatedFileSystem,
+                 base::Unretained(this)));
+}
+
+v8::Handle<v8::Value> FileSystemNatives::GetIsolatedFileSystem(
     const v8::Arguments& args) {
   DCHECK(args.Length() == 1 || args.Length() == 2);
   DCHECK(args[0]->IsString());
   std::string file_system_id(*v8::String::Utf8Value(args[0]));
-  WebKit::WebFrame* webframe = WebKit::WebFrame::frameForCurrentContext();
+  WebKit::WebFrame* webframe = WebKit::WebFrame::frameForContext(v8_context());
   DCHECK(webframe);
 
   GURL context_url =
       extensions::UserScriptSlave::GetDataSourceURLForFrame(webframe);
   CHECK(context_url.SchemeIs(extensions::kExtensionScheme));
 
   std::string name(fileapi::GetIsolatedFileSystemName(context_url.GetOrigin(),
                                                       file_system_id));
 
   // The optional second argument is the subfolder within the isolated file
   // system at which to root the DOMFileSystem we're returning to the caller.
   std::string optional_root_name;
   if (args.Length() == 2) {
     DCHECK(args[1]->IsString());
     optional_root_name = *v8::String::Utf8Value(args[1]);
   }
 
   std::string root(fileapi::GetIsolatedFileSystemRootURIString(
       context_url.GetOrigin(),
       file_system_id,
       optional_root_name));
 
   return webframe->createFileSystem(
       WebKit::WebFileSystem::TypeIsolated,
       WebKit::WebString::fromUTF8(name),
       WebKit::WebString::fromUTF8(root));
 }
 
-static v8::Handle<v8::Value> GetFileEntry(const v8::Arguments& args) {
+v8::Handle<v8::Value> FileSystemNatives::GetFileEntry(
+    const v8::Arguments& args) {
   DCHECK(args.Length() == 5);
   DCHECK(args[0]->IsString());
   std::string type_string = *v8::String::Utf8Value(args[0]->ToString());
   WebKit::WebFileSystem::Type type;
   bool is_valid_type = fileapi::GetFileSystemPublicType(type_string, &type);
   DCHECK(is_valid_type);
   if (is_valid_type == false) {
     return v8::Undefined();
   }
 
   DCHECK(args[1]->IsString());
   DCHECK(args[2]->IsString());
   DCHECK(args[3]->IsString());
   std::string file_system_name(*v8::String::Utf8Value(args[1]->ToString()));
   std::string file_system_root_url(*v8::String::Utf8Value(args[2]->ToString()));
   std::string file_path_string(*v8::String::Utf8Value(args[3]->ToString()));
   base::FilePath file_path = base::FilePath::FromUTF8Unsafe(file_path_string);
   DCHECK(fileapi::VirtualPath::IsAbsolute(file_path.value()));
 
   DCHECK(args[4]->IsBoolean());
   bool is_directory = args[4]->BooleanValue();
 
-  WebKit::WebFrame* webframe = WebKit::WebFrame::frameForCurrentContext();
+  WebKit::WebFrame* webframe = WebKit::WebFrame::frameForContext(v8_context());
   DCHECK(webframe);
   return webframe->createFileEntry(
       type,
       WebKit::WebString::fromUTF8(file_system_name),
       WebKit::WebString::fromUTF8(file_system_root_url),
       WebKit::WebString::fromUTF8(file_path_string),
       is_directory);
 }
 
-}  // namespace
-
-namespace extensions {
-
-FileSystemNatives::FileSystemNatives()
-    : ChromeV8Extension(NULL) {
-  RouteStaticFunction("GetFileEntry", &GetFileEntry);
-  RouteStaticFunction("GetIsolatedFileSystem", &GetIsolatedFileSystem);
-}
-
 }  // namespace extensions