Add ability to set resolution on external display

chromeos/display/output_configurator.h

Index: chromeos/display/output_configurator.h
diff --git a/chromeos/display/output_configurator.h b/chromeos/display/output_configurator.h
index 5385b71f4922930cead5c771e1fe1a3d1fbcce41..a308a45478833113de3c9b4f98221c87a845ab78 100644
--- a/chromeos/display/output_configurator.h
+++ b/chromeos/display/output_configurator.h
@@ -55,6 +55,7 @@ class CHROMEOS_EXPORT OutputConfigurator
     RRMode current_mode;
     RRMode native_mode;
     RRMode mirror_mode;
+    RRMode selected_mode;
 
     int y;
     int height;
@@ -114,6 +115,12 @@ class CHROMEOS_EXPORT OutputConfigurator
     // Called when displays are detected.
     virtual OutputState GetStateForDisplayIds(
         const std::vector<int64>& display_ids) const = 0;
+
+    // Queries the resolution (|width|x|height|) in pixels
+    // to select output mode for the given display id.
+    virtual bool GetResolutionForDisplayId(int64 display_id,
+                                           int* width,
+                                           int* height) const = 0;
   };
 
   // Interface for classes that implement software based mirroring.
@@ -159,7 +166,8 @@ class CHROMEOS_EXPORT OutputConfigurator
 
     // Returns information about the current outputs.
     // This method may block for 60 milliseconds or more.
-    virtual std::vector<OutputSnapshot> GetOutputs() = 0;
+    virtual std::vector<OutputSnapshot> GetOutputs(
+        const StateController* state_controller) = 0;
 
     // Gets details corresponding to |mode|.  Parameters may be NULL.
     // Returns true on success.
@@ -303,14 +311,14 @@ class CHROMEOS_EXPORT OutputConfigurator
     return mirrored_display_area_ratio_map_;
   }
 
- private:
-  // Configure outputs.
-  void ConfigureOutputs();
-
   // Configure outputs with |kConfigureDelayMs| delay,
   // so that time-consuming ConfigureOutputs() won't be called multiple times.
   void ScheduleConfigureOutputs();
 
+ private:
+  // Configure outputs.
+  void ConfigureOutputs();
+
   // Fires OnDisplayModeChanged() event to the observers.
   void NotifyOnDisplayChanged();