Add BlimpDocument, pull out functions in BlimpCompositor.

blimp/client/core/render_widget/blimp_document_manager.h

 // 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.
 
-#ifndef BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_COMPOSITOR_MANAGER_H_
-#define BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_COMPOSITOR_MANAGER_H_
+#ifndef BLIMP_CLIENT_CORE_RENDER_WIDGET_BLIMP_DOCUMENT_MANAGER_H_
+#define BLIMP_CLIENT_CORE_RENDER_WIDGET_BLIMP_DOCUMENT_MANAGER_H_
 
 #include <map>
 
 #include "base/macros.h"
 #include "blimp/client/core/compositor/blimp_compositor.h"
-#include "blimp/client/core/compositor/blob_image_serialization_processor.h"
 #include "blimp/client/core/render_widget/render_widget_feature.h"
 #include "cc/layers/layer.h"
 #include "cc/trees/layer_tree_settings.h"
 
 namespace blimp {
 namespace client {
 
-// The BlimpCompositorManager manages multiple BlimpCompositor instances, each
-// mapped to a render widget on the engine. The compositor corresponding to
-// the render widget initialized on the engine will be the |active_compositor_|.
-// Only the |active_compositor_| holds the accelerated widget and builds the
-// output surface from this widget to draw to the view. All events from the
-// native view are forwarded to this compositor.
-class BlimpCompositorManager
-    : public RenderWidgetFeature::RenderWidgetFeatureDelegate,
-      public BlimpCompositorClient {
+class BlimpDocument;
+
+// The BlimpDocumentManager

[David Trainor- moved to gerrit, 2016/10/04 22:29:02]

Suggest:
The BlimpDocumentManager is responsible for:
1. Managing ...
2. The compositor ...

[xingliu, 2016/10/05 00:40:08]

Done.

+// 1. Manages multiple BlimpDocument instances, each mapped to a render widget
+// on the engine. The |document_id_| matches the |render_widget_id| of the
+// render widget messages which are routed to the engine side render widget.
+//
+// 2. The compositor corresponding to the render widget initialized on the
+// engine will be the |active_document_|.
+// All events from the native view are forwarded to this compositor.
+class BlimpDocumentManager
+    : public RenderWidgetFeature::RenderWidgetFeatureDelegate {
  public:
-  explicit BlimpCompositorManager(
+  explicit BlimpDocumentManager(
       int blimp_contents_id,
       RenderWidgetFeature* render_widget_feature,
       BlimpCompositorDependencies* compositor_dependencies);
-  ~BlimpCompositorManager() override;
+  ~BlimpDocumentManager() override;
 
   void SetVisible(bool visible);
   bool visible() const { return visible_; }
 
   bool OnTouchEvent(const ui::MotionEvent& motion_event);
 
   // Notifies |callback| when all pending commits on the active BlimpCompositor
   // have been drawn to the screen.  If the active compositor is destroyed or
   // becomes hidden |callback| will be notified.
   void NotifyWhenDonePendingCommits(base::Closure callback);
 
+  // Sends input event to the engine, virtual for testing.
+  virtual void SendWebGestureEvent(int document_id,
+                                   const blink::WebGestureEvent& gesture_event);
+
+  // Sends compositor message to the engine, virtual for testing.
+  virtual void SendCompositorMessage(
+      int document_id,
+      const cc::proto::CompositorMessage& message);
+
   scoped_refptr<cc::Layer> layer() const { return layer_; }
 
  protected:
-  // virtual for testing.
-  virtual std::unique_ptr<BlimpCompositor> CreateBlimpCompositor(
-      int render_widget_id,
-      BlimpCompositorDependencies* compositor_dependencies,
-      BlimpCompositorClient* client);
+  // Creates a BlimpDocument, virtual for testing.
+  virtual std::unique_ptr<BlimpDocument> CreateBlimpDocument(
+      int document_id,
+      BlimpCompositorDependencies* compositor_dependencies);
 
-  // Returns the compositor for the |render_widget_id|. Will return nullptr if
-  // no compositor is found.
-  // protected for testing.
-  BlimpCompositor* GetCompositor(int render_widget_id);
+  // Returns the blimp document from |document_id|, returns nullptr if
+  // the document is not found, protected for testing.
+  BlimpDocument* GetDocument(int document_id);
 
  private:
   // RenderWidgetFeatureDelegate implementation.
   void OnRenderWidgetCreated(int render_widget_id) override;
   void OnRenderWidgetInitialized(int render_widget_id) override;
   void OnRenderWidgetDeleted(int render_widget_id) override;
   void OnCompositorMessageReceived(
       int render_widget_id,
       std::unique_ptr<cc::proto::CompositorMessage> message) override;
 
-  // BlimpCompositorClient implementation.
-  void SendWebGestureEvent(
-      int render_widget_id,
-      const blink::WebGestureEvent& gesture_event) override;
-  void SendCompositorMessage(
-      int render_widget_id,
-      const cc::proto::CompositorMessage& message) override;
-
+  // The unique id of BlimpContentImpl which owns this document manager.
   int blimp_contents_id_;
 
   // The bridge to the network layer that does the proto/RenderWidget id work.
   // BlimpCompositorManager does not own this and it is expected to outlive this
   // BlimpCompositorManager instance.
   RenderWidgetFeature* render_widget_feature_;
 
   bool visible_;
 
   // The layer which holds the content from the active compositor.
   scoped_refptr<cc::Layer> layer_;
 
-  // A map of render_widget_ids to the BlimpCompositor instance.
-  using CompositorMap = std::map<int, std::unique_ptr<BlimpCompositor>>;
-  CompositorMap compositors_;
+  // A map of document id to the BlimpDocument instance.
+  using DocumentMap = std::map<int, std::unique_ptr<BlimpDocument>>;
+  DocumentMap documents_;
 
-  // The |active_compositor_| represents the compositor from the CompositorMap
-  // that is currently visible and has the |window_|. It corresponds to the
+  // The |active_document_| holds the compositor from the that is currently
+  // visible. It corresponds to the
   // render widget currently initialized on the engine.
-  BlimpCompositor* active_compositor_;
+  BlimpDocument* active_document_;
 
   BlimpCompositorDependencies* compositor_dependencies_;
 
-  DISALLOW_COPY_AND_ASSIGN(BlimpCompositorManager);
+  DISALLOW_COPY_AND_ASSIGN(BlimpDocumentManager);
 };
 
 }  // namespace client
 }  // namespace blimp
 
-#endif  // BLIMP_CLIENT_CORE_COMPOSITOR_BLIMP_COMPOSITOR_MANAGER_H_
+#endif  // BLIMP_CLIENT_CORE_RENDER_WIDGET_BLIMP_DOCUMENT_MANAGER_H_