Make WebView respond to device scale change

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index ec613ea349f678a3136d0c25b83da3892a9e7f5f..3552f5018c474cb3d42affa930ecd481cbc9ea1c 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -920,6 +920,15 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
     }
 
     /**
+     * Sets the device scale factor (maps DIP pixels to physical pixels).
+     */
+    public void setDeviceScaleFactor(float value) {
+        mRenderCoordinates.setDeviceScaleFactor(value);
+        if (mNativeContentViewCore == 0) return;
+        nativeSetDeviceScaleFactor(mNativeContentViewCore, value);
+    }
+
+    /**
      * @return Current page scale factor (maps CSS pixels to DIP pixels).
      */
     @VisibleForTesting
@@ -3278,6 +3287,8 @@ public class ContentViewCore implements AccessibilityStateChangeListener, Screen
 
     private native void nativeSetFocus(long nativeContentViewCoreImpl, boolean focused);
 
+    private native void nativeSetDeviceScaleFactor(long nativeContentViewCoreImpl, float value);
+
     private native void nativeSendOrientationChangeEvent(
             long nativeContentViewCoreImpl, int orientation);