VR- Disable hosted dialogs in WebVr

Ideally we should be able to show the dialogs in a meta world when
in WebVR. For now, this patch makes sure that no dialog is opened
in WebVR. Moreover, the dialog will be dismissed.

BUG=none

Change-Id: I32e8d7aed84927f1057a4a13e42622d9eceeb301
Reviewed-on: https://chromium-review.googlesource.com/932442
Commit-Queue: Amirhossein Simjour <asimjour@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#538844}

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

@@ -1258,7 +1258,7 @@ public class VrShellDelegate
     }
 
     @CalledByNative
-    private void exitWebVRPresent() {
+    /* package */ void exitWebVRPresent() {
         if (!mInVr) return;
         if (mAutopresentWebVr) {
             // For autopresent from Daydream home, we do NOT want to show ChromeVR. So if we

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

@@ -692,6 +692,7 @@ public class VrShellImpl
      */
     @Override
     public void setDialogView(View view) {
+        if (getWebVrModeEnabled()) return;
         if (view == null) return;
         assert mVrUiViewContainer.getChildCount() == 0;
         mVrUiViewContainer.addView(view);
@@ -711,6 +712,7 @@ public class VrShellImpl
      */
     @Override
     public void setDialogSize(int width, int height) {
+        if (getWebVrModeEnabled()) return;
         nativeSetAlertDialogSize(mNativeVrShell, width, height);
     }
 
@@ -719,6 +721,23 @@ public class VrShellImpl
      */
     @Override
     public void initVrDialog(int width, int height) {
+        if (getWebVrModeEnabled()) {
+            if (mVrBrowsingEnabled) {
+                mDelegate.exitWebVRPresent();
+            } else {
+                // TODO (asimjour): We should be able to show the dialogs in webvr. But for now,
+                // we close the dialog. Closing the dialog cannot happen in the show() method,
+                // therefore we have to post task the call to Presenter to close the dialog.
+                ThreadUtils.postOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        mVrModalPresenter.closeCurrentDialog();
+                    }
+                });
+                return;
+            }
+        }
+
         nativeSetAlertDialog(mNativeVrShell, width, height);
         mAndroidDialogGestureTarget = new AndroidUiGestureTarget(
                 mVrUiViewContainer.getInputTarget(), 1.0f, getNativePageScrollRatio());