Add overscanCalibration methods to system_display.idl

extensions/common/api/system_display.idl

Index: extensions/common/api/system_display.idl
diff --git a/extensions/common/api/system_display.idl b/extensions/common/api/system_display.idl
index ccb4a716dda6185ffd72a59b35b557b5cdfebee2..31fe79c6e97ae7522f0578a9d999d9453f14652b 100644
--- a/extensions/common/api/system_display.idl
+++ b/extensions/common/api/system_display.idl
@@ -180,6 +180,30 @@ namespace system.display {
     // NOTE: This is only available to Chrome OS Kiosk apps and Web UI.
     // |enabled|: True if unified desktop should be enabled.
     static void enableUnifiedDesktop(boolean enabled);
+
+    // Starts overscan calibration for a display. This will show an overlay
+    // on the screen indicating the current overscan insets. If overscan
+    // calibration for display |id| is in progress this will reset calibration.
+    // |id|: The display's unique identifier.
+    static void overscanCalibrationStart(DOMString id);
+
+    // Adjusts the current overscan insets for a display. Typically this should
+    // etiher move the display along an axis (e.g. left+right have the same
+    // value) or scale it along an axis (e.g. top+bottom have opposite values).
+    // Each Adjust call is cumulative with previous calls since Start.
+    // |id|: The display's unique identifier.
+    // |delta|: The amount to change the overscan insets.
+    static void overscanCalibrationAdjust(DOMString id, Insets delta);
+
+    // Resets the overscan insets for a display to the last saved value (i.e
+    // before Start was called).
+    // |id|: The display's unique identifier.
+    static void overscanCalibrationReset(DOMString id);
+
+    // Complete overscan adjustments for a display  by saving the current values

[oshima, 2016/05/21 01:16:36]

nit: extra space between "display" and "by"

+    // and hiding the overlay.
+    // |id|: The display's unique identifier.
+    static void overscanCalibrationComplete(DOMString id);
   };
 
   interface Events {