Add "Request app banner" context menu in DevTools

chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java b/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
index 1bfaac7c42c4d1443e60ace2516071355d54dd2d..ca0f3b75b8b82c5b8b779c9ac8abe9262404b4e1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/banners/AppBannerManager.java
@@ -137,6 +137,11 @@ public class AppBannerManager extends EmptyTabObserver {
         };
     }
 
+    /** Tries to open the app banner. This method is called from the DevTools. */
+    public void openAppBanner() {
+        nativeOpenAppBanner(mNativePointer);
+    }
+
     /** Enables or disables the app banners for testing. */
     @VisibleForTesting
     static void setIsEnabledForTesting(boolean state) {
@@ -173,6 +178,7 @@ public class AppBannerManager extends EmptyTabObserver {
             WebContents webContents);
     private native boolean nativeOnAppDetailsRetrieved(long nativeAppBannerManagerAndroid,
             AppData data, String title, String packageName, String imageUrl);
+    private native void nativeOpenAppBanner(long nativeAppBannerManagerAndroid);
 
     // Testing methods.
     private static native void nativeSetTimeDeltaForTesting(int days);