Use Display instead of DisplayMetrics to find out the Display size.

It solves issues where we were sometimes getting stale data,
especially if reading information after a DisplayListener event.

BUG=354275

Review URL: https://codereview.chromium.org/212933012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260223 0039d316-1c4b-4281-b951-d872f2087c98

ui/android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java

@@ -31,6 +31,7 @@ public class DeviceDisplayInfo {
     private final Context mAppContext;
     private final WindowManager mWinManager;
     private Point mTempPoint = new Point();
+    private DisplayMetrics mTempMetrics = new DisplayMetrics();
 
     private DeviceDisplayInfo(Context context) {
         mAppContext = context.getApplicationContext();
@@ -42,7 +43,8 @@ public class DeviceDisplayInfo {
      */
     @CalledByNative
     public int getDisplayHeight() {
-        return getMetrics().heightPixels;
+        getDisplay().getSize(mTempPoint);
+        return mTempPoint.y;
     }
 
     /**
@@ -50,7 +52,8 @@ public class DeviceDisplayInfo {
      */
     @CalledByNative
     public int getDisplayWidth() {
-        return getMetrics().widthPixels;
+        getDisplay().getSize(mTempPoint);
+        return mTempPoint.x;
     }
 
     /**
@@ -140,7 +143,8 @@ public class DeviceDisplayInfo {
      */
     @CalledByNative
     public double getDIPScale() {
-        return getMetrics().density;
+        getDisplay().getMetrics(mTempMetrics);
+        return mTempMetrics.density;
     }
 
     /**
@@ -178,10 +182,6 @@ public class DeviceDisplayInfo {
         return mWinManager.getDefaultDisplay();
     }
 
-    private DisplayMetrics getMetrics() {
-        return mAppContext.getResources().getDisplayMetrics();
-    }
-
     /**
      * Creates DeviceDisplayInfo for a given Context.
      *