Support autopresenting WebVr content.

chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
index 27c46ed667dec4df0a9416d31ac048f754bda2f8..6a89e97ac728a1e6ebbf38e3ed492b53370d950d 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeActivity.java
@@ -643,6 +643,14 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
         mTabModelsInitialized = true;
     }
 
+    /**
+     * @return Whether this activity can automatically present WebVr content in fullscreen
+     *         binocular rendering mode. Normally, WebVr presentation is user initiated.
+     */
+    public boolean canAutopresentVr() {

[mthiesse, 2017/05/10 14:52:14]

I don't know what Ted's opinion on this is, but so far we've been avoiding
making these activities aware of VR where possible.

See VrShellDelegate#activitySupportsVrBrowsing for how I've been doing similar
things so far. You could add a VrShellDelegate#activitySupportsWebVrAutopresent.

[Ted C, 2017/05/11 00:05:03]

Adding this to VrShellDelegate sgtm and seems consistent.

[ymalik, 2017/05/11 03:32:27]

Done.

+        return false;
+    }
+
     /**
      * @return The {@link TabModelSelector} owned by this {@link ChromeActivity}.
      */
@@ -792,6 +800,8 @@ public abstract class ChromeActivity extends AsyncInitializationActivity
         if (mDeferredStartupQueued || getActivityTab() == null || !getActivityTab().isLoading()) {
             postDeferredStartupIfNeeded();
         }
+
+        VrShellDelegate.onNewIntent(this, getIntent());

[mthiesse, 2017/05/10 14:52:14]

What happens when you use the task switcher to switch away from chrome, then
back to chrome? Won't this read the same intent and try to autopresent again
when you resume Chrome?

[Ted C, 2017/05/11 00:05:03]

Yes it would, why not have this in onNewIntentWithNative?  The gotcha is that
isn't
called for the initial run, so you would need to add any additional logic in
this "general"
area.

https://cs.chromium.org/chromium/src/chrome/android/java/src/org/chromium/chr...

[ymalik, 2017/05/11 03:32:27]

Thanks for the tip. Done.

     }
 
     @Override