Add "Request app banner" context menu in DevTools

chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
index 364e6978572f97d58fdd055729fd03004f31b177..152f5bfe28ceb0aefc00513da7e179c0b926e36a 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tab/Tab.java
@@ -2182,6 +2182,14 @@ public final class Tab implements ViewGroup.OnHierarchyChangeListener,
         swapContentViewCore(cvc, false, didStartLoad, didFinishLoad);
     }
 
+    /** Tries to open the app banner. This method is called from the DevTools. */
+    @CalledByNative
+    public boolean openAppBanner() {
+        if (mAppBannerManager == null) return false;
+        mAppBannerManager.openAppBanner();
+        return true;
+    }
+
     /**
      * Called to swap out the current view with the one passed in.
      *