[Ozone-DRI] Fix blank screen on init

ui/ozone/platform/dri/screen_manager.h

 // 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 UI_OZONE_PLATFORM_DRI_SCREEN_MANAGER_H_
 #define UI_OZONE_PLATFORM_DRI_SCREEN_MANAGER_H_
 
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 39 matching lines @@
 
   // Returns a reference to the display controller configured to display within
   // |bounds|.
   // This returns a weak reference since the display controller may be destroyed
   // at any point in time, but the changes are propagated to the compositor much
   // later (Compositor owns SurfaceOzone*, which is responsible for updating the
   // display surface).
   base::WeakPtr<HardwareDisplayController> GetDisplayController(
       const gfx::Rect& bounds);
 
+  // On non CrOS builds there is no display configurator to look-up available
+  // displays and initialize the HDCs. In such cases this is called internally
+  // to initialize a display.
+  virtual void ForceInitializationOfPrimaryDisplay();
+
  private:
   typedef ScopedVector<HardwareDisplayController> HardwareDisplayControllers;
 
   // Returns an iterator into |controllers_| for the controller identified by
   // (|crtc|, |connector|).
   HardwareDisplayControllers::iterator FindDisplayController(uint32_t crtc);
 
   // Returns an iterator into |controllers_| for the controller located at
   // |origin|.
   HardwareDisplayControllers::iterator FindActiveDisplayControllerByLocation(
       const gfx::Rect& bounds);
 
-  // Returns an iterator to the first controller located at |origin|. The
-  // controller may be disabled.
-  HardwareDisplayControllers::iterator FindDisplayControllerByLocation(
-      const gfx::Rect& bounds);
-
   // Perform modesetting in |controller| using |origin| and |mode|.
   bool ModesetDisplayController(HardwareDisplayController* controller,
                                 const gfx::Point& origin,
                                 const drmModeModeInfo& mode);
 
   // Tries to set the controller identified by (|crtc|, |connector|) to mirror
   // those in |mirror|. |original| is an iterator to the HDC where the
   // controller is currently present.
   bool HandleMirrorMode(HardwareDisplayControllers::iterator original,
                         HardwareDisplayControllers::iterator mirror,
                         uint32_t crtc,
                         uint32_t connector);
 
-  // On non CrOS builds there is no display configurator to look-up available
-  // displays and initialize the HDCs. In such cases this is called internally
-  // to initialize a display.
-  virtual void ForceInitializationOfPrimaryDisplay();
-
   DriWrapper* dri_;  // Not owned.
   ScanoutBufferGenerator* buffer_generator_;  // Not owned.
   // List of display controllers (active and disabled).
   HardwareDisplayControllers controllers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenManager);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_SCREEN_MANAGER_H_