Move BlimpInputManager to BlimpDocument from BlimpCompositor.

blimp/client/core/render_widget/blimp_document.h

Index: blimp/client/core/render_widget/blimp_document.h
diff --git a/blimp/client/core/render_widget/blimp_document.h b/blimp/client/core/render_widget/blimp_document.h
index d03b7d172f465306efc419cea45658890903ab8b..57f46ce81d1de4ac234ae1fabd71a7cf8d4cbfc2 100644
--- a/blimp/client/core/render_widget/blimp_document.h
+++ b/blimp/client/core/render_widget/blimp_document.h
@@ -10,6 +10,7 @@
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "blimp/client/core/compositor/blimp_compositor.h"
+#include "blimp/client/core/input/blimp_input_manager.h"
 
 namespace blimp {
 namespace client {
@@ -20,7 +21,9 @@ class BlimpDocumentManager;
 // BlimpDocument maps to an engine side render widget.
 // 1. Is created on receiving an RenderWidgetMessage from the engine.
 // 2. Owns the BlimpCompositor instance.
-class BlimpDocument : public BlimpCompositorClient {
+// 3. Handles touch events and forward them to the engine.
+class BlimpDocument : public BlimpCompositorClient,
+                      public BlimpInputManagerClient {
  public:
   BlimpDocument(int document_id,
                 BlimpCompositorDependencies* compositor_dependencies,
@@ -32,16 +35,26 @@ class BlimpDocument : public BlimpCompositorClient {
   // Returns the compositor instance.
   BlimpCompositor* GetCompositor();
 
+  // Forwards the touch event to the |input_manager_|.
+  // virtual for testing.
+  virtual bool OnTouchEvent(const ui::MotionEvent& motion_event);
+
  protected:
-  void SetCompositorForTest(std::unique_ptr<BlimpCompositor> compositor);
+  // Constructor that may take a mock compositor as input for testing.
+  BlimpDocument(int document_id,
+                std::unique_ptr<BlimpCompositor> compositor,
+                BlimpCompositorDependencies* compositor_dependencies,
+                BlimpDocumentManager* document_manager);
 
  private:
   // BlimpCompositorClient implementation.
-  void SendWebGestureEvent(
-      const blink::WebGestureEvent& gesture_event) override;
   void SendCompositorMessage(
       const cc::proto::CompositorMessage& message) override;
 
+  // BlimpInputManagerClient implementation.
+  void SendWebGestureEvent(
+      const blink::WebGestureEvent& gesture_event) override;
+
   // The unique identifier for this document instance.
   const int document_id_;
 
@@ -51,6 +64,14 @@ class BlimpDocument : public BlimpCompositorClient {
   // Used to send messages to the corresponding render widget on the engine.
   BlimpDocumentManager* manager_;
 
+  // Handles input events for the current document. The lifetime of the
+  // input manager is tied to the lifetime of the layer tree host of its
+  // compositor which owns the cc::InputHandler.
+  // The input events are forwarded to this input handler by
+  // the manager to be handled by the client compositor for the current
+  // document.
+  std::unique_ptr<BlimpInputManager> input_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(BlimpDocument);
 };