ozone: Initialize a subsystem only if necessary.

ui/ozone/platform/caca/ozone_platform_caca.cc

 // 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.
 
 #include "ui/ozone/platform/caca/ozone_platform_caca.h"
 
 #include "ui/base/cursor/ozone/cursor_factory_ozone.h"
 #include "ui/ozone/ime/input_method_context_factory_ozone.h"
 #include "ui/ozone/ozone_platform.h"
 #include "ui/ozone/platform/caca/caca_connection.h"
 #include "ui/ozone/platform/caca/caca_event_factory.h"
 #include "ui/ozone/platform/caca/caca_surface_factory.h"
 
 #if defined(OS_CHROMEOS)
 #include "ui/ozone/common/chromeos/native_display_delegate_ozone.h"
 #endif
 
 namespace ui {
 
 namespace {
 
 class OzonePlatformCaca : public OzonePlatform {
  public:
-  OzonePlatformCaca()
-      : surface_factory_ozone_(&connection_),
-        event_factory_ozone_(&connection_) {}
+  OzonePlatformCaca() {}
   virtual ~OzonePlatformCaca() {}
 
   // OzonePlatform:
   virtual gfx::SurfaceFactoryOzone* GetSurfaceFactoryOzone() OVERRIDE {
-    return &surface_factory_ozone_;
+    return surface_factory_ozone_.get();
   }
   virtual EventFactoryOzone* GetEventFactoryOzone() OVERRIDE {
-    return &event_factory_ozone_;
+    return event_factory_ozone_.get();
   }
   virtual InputMethodContextFactoryOzone* GetInputMethodContextFactoryOzone()
       OVERRIDE {
-    return &input_method_context_factory_ozone_;
+    return input_method_context_factory_ozone_.get();
   }
   virtual CursorFactoryOzone* GetCursorFactoryOzone() OVERRIDE {
-    return &cursor_factory_ozone_;
+    return cursor_factory_ozone_.get();
   }
 
 #if defined(OS_CHROMEOS)
   virtual scoped_ptr<NativeDisplayDelegate> CreateNativeDisplayDelegate()
       OVERRIDE {
     return scoped_ptr<NativeDisplayDelegate>(new NativeDisplayDelegateOzone());
   }
 #endif
 
+  virtual void InitializeUI() OVERRIDE {
+    surface_factory_ozone_.reset(new CacaSurfaceFactory(&connection_));
+    event_factory_ozone_.reset(new CacaEventFactory(&connection_));
+    input_method_context_factory_ozone_.reset(
+        new InputMethodContextFactoryOzone());
+    cursor_factory_ozone_.reset(new CursorFactoryOzone());
+  }
+
+  virtual void InitializeGPU() OVERRIDE {}
+
  private:
   CacaConnection connection_;
-  CacaSurfaceFactory surface_factory_ozone_;
-  CacaEventFactory event_factory_ozone_;
+  scoped_ptr<CacaSurfaceFactory> surface_factory_ozone_;
+  scoped_ptr<CacaEventFactory> event_factory_ozone_;
   // This creates a minimal input context.
-  InputMethodContextFactoryOzone input_method_context_factory_ozone_;
-  CursorFactoryOzone cursor_factory_ozone_;
+  scoped_ptr<InputMethodContextFactoryOzone>
+      input_method_context_factory_ozone_;
+  scoped_ptr<CursorFactoryOzone> cursor_factory_ozone_;
 
   DISALLOW_COPY_AND_ASSIGN(OzonePlatformCaca);
 };
 
 }  // namespace
 
 OzonePlatform* CreateOzonePlatformCaca() { return new OzonePlatformCaca; }
 
 }  // namespace ui