[Android] Implement renderer side of Gin Java Bridge

This change adds GinJavaBridgeObject and GinJavaBridgeDispatcher classes.

GinJavaBridgeDispatcher is a per-RenderFrame manager of injected
objects. It interacts with the browser side.

GinJavaBridgeObject is a Gin-based wrapper injected into page's context
that exposes methods of the corresponding Java object and receives
method invocation requests from JavaScript.

BUG=355644
R=jochen@chromium.org, thakis@chromium.org

Review URL: https://codereview.chromium.org/259033002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@272997 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 72 insertions, 0 deletions

diff --git a/content/renderer/java/gin_java_bridge_dispatcher.h b/content/renderer/java/gin_java_bridge_dispatcher.h
new file mode 100644
index 0000000..c5348b97
--- /dev/null
+++ b/content/renderer/java/gin_java_bridge_dispatcher.h
@@ -0,0 +1,72 @@
+// Copyright 2014 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.
+
+#ifndef CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_DISPATCHER_H_
+#define CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_DISPATCHER_H_
+
+#include <map>
+#include <set>
+
+#include "base/id_map.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace blink {
+class WebFrame;
+}
+
+namespace content {
+
+class GinJavaBridgeObject;
+
+// This class handles injecting Java objects into the main frame of a
+// RenderView. The 'add' and 'remove' messages received from the browser
+// process modify the entries in a map of 'pending' objects. These objects are
+// bound to the window object of the main frame when that window object is next
+// cleared. These objects remain bound until the window object is cleared
+// again.
+class GinJavaBridgeDispatcher
+    : public base::SupportsWeakPtr<GinJavaBridgeDispatcher>,
+      public RenderFrameObserver {
+ public:
+  // GinJavaBridgeObjects are managed by gin. An object gets destroyed
+  // when it is no more referenced from JS. As GinJavaBridgeObject reports
+  // deletion of self to GinJavaBridgeDispatcher, we would not have stale
+  // pointers here.
+  typedef IDMap<GinJavaBridgeObject, IDMapExternalPointer> ObjectMap;
+  typedef ObjectMap::KeyType ObjectID;
+
+  explicit GinJavaBridgeDispatcher(RenderFrame* render_frame);
+  virtual ~GinJavaBridgeDispatcher();
+
+  // RenderFrameObserver override:
+  virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
+  virtual void DidClearWindowObject() OVERRIDE;
+
+  void GetJavaMethods(ObjectID object_id, std::set<std::string>* methods);
+  bool HasJavaMethod(ObjectID object_id, const std::string& method_name);
+  scoped_ptr<base::Value> InvokeJavaMethod(ObjectID object_id,
+                                           const std::string& method_name,
+                                           const base::ListValue& arguments);
+  GinJavaBridgeObject* GetObject(ObjectID object_id);
+  void OnGinJavaBridgeObjectDeleted(ObjectID object_id);
+
+ private:
+  void OnAddNamedObject(const std::string& name,
+                        ObjectID object_id);
+  void OnRemoveNamedObject(const std::string& name);
+  void OnSetAllowObjectContentsInspection(bool allow);
+
+  typedef std::map<std::string, ObjectID> NamedObjectMap;
+  NamedObjectMap named_objects_;
+  ObjectMap objects_;
+
+  DISALLOW_COPY_AND_ASSIGN(GinJavaBridgeDispatcher);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_DISPATCHER_H_