Store physical backing size in ViewAndroid

chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
index 86382f1871bce979de2cc6b45ce8ebcb6b1f98dd..aff70783ec833767b94a72b89916cdf694855b6e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/vr_shell/VrShellImpl.java
@@ -373,7 +373,8 @@ public class VrShellImpl
         mContentVirtualDisplay.update(size, dpr, null, null, null);
         if (mTab != null && mTab.getContentViewCore() != null) {
             mTab.getContentViewCore().onSizeChanged(surfaceWidth, surfaceHeight, 0, 0);
-            mTab.getContentViewCore().onPhysicalBackingSizeChanged(surfaceWidth, surfaceHeight);
+            nativeOnPhysicalBackingSizeChanged(mNativeVrShell,
+                    mTab.getContentViewCore().getWebContents(), surfaceWidth, surfaceHeight);
         }
         mRenderToSurfaceLayout.setLayoutParams(
                 new FrameLayout.LayoutParams(surfaceWidth, surfaceHeight));
@@ -608,6 +609,8 @@ public class VrShellImpl
     private native void nativeOnPause(long nativeVrShell);
     private native void nativeOnResume(long nativeVrShell);
     private native void nativeOnLoadProgressChanged(long nativeVrShell, double progress);
+    private native void nativeOnPhysicalBackingSizeChanged(
+            long nativeVrShell, WebContents webContents, int width, int height);
     private native void nativeContentPhysicalBoundsChanged(long nativeVrShell, int width,
             int height, float dpr);
     private native void nativeSetWebVrMode(long nativeVrShell, boolean enabled);