[chromecast] Enable Mojo javascript bindings for cast_shell

chromecast/renderer/cast_gin_runner.cc

Index: chromecast/renderer/cast_gin_runner.cc
diff --git a/chromecast/renderer/cast_gin_runner.cc b/chromecast/renderer/cast_gin_runner.cc
new file mode 100644
index 0000000000000000000000000000000000000000..e761ce4a410900605a34a172205c24d22db93cbd
--- /dev/null
+++ b/chromecast/renderer/cast_gin_runner.cc
@@ -0,0 +1,45 @@
+// Copyright 2016 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 "chromecast/renderer/cast_gin_runner.h"
+
+#include "gin/per_context_data.h"
+#include "third_party/WebKit/public/web/WebFrame.h"
+#include "third_party/WebKit/public/web/WebScriptSource.h"
+
+namespace chromecast {
+namespace shell {
+
+CastGinRunner::CastGinRunner(blink::WebFrame* frame,
+                             gin::ContextHolder* context_holder)
+    : frame_(frame), context_holder_(context_holder) {
+  DCHECK(context_holder);
+  DCHECK(frame_);
+  v8::Isolate::Scope isolate_scope(context_holder->isolate());
+  v8::HandleScope handle_scope(context_holder->isolate());
+  // Note: this installs the runner globally. If we need to support more than
+  // one runner at a time we'll have to revisit this.
+  gin::PerContextData::From(context_holder->context())->set_runner(this);
+}
+
+void CastGinRunner::Run(const std::string& source,
+                        const std::string& resource_name) {
+  frame_->executeScript(
+      blink::WebScriptSource(blink::WebString::fromUTF8(source)));
+}
+
+v8::Local<v8::Value> CastGinRunner::Call(v8::Local<v8::Function> function,
+                                         v8::Local<v8::Value> receiver,
+                                         int argc,
+                                         v8::Local<v8::Value> argv[]) {
+  return frame_->callFunctionEvenIfScriptDisabled(function, receiver, argc,
+                                                  argv);
+}
+
+gin::ContextHolder* CastGinRunner::GetContextHolder() {
+  return context_holder_;
+}
+
+}  // namespace shell
+}  // namespace chromecast