Enable deep-linking from notifications for recently used web apps on the Android home screen.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
index 0ab0d9dd95c5568afc62e2793e6e559c90b8e8bf..ca8820969e556d875a0cd597a51603fe298ecb51 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebappLauncherActivity.java
@@ -14,6 +14,7 @@ import android.util.Base64;
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.ApplicationStatus;
 import org.chromium.base.Log;
+import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.ShortcutHelper;
 import org.chromium.chrome.browser.document.ChromeLauncherActivity;
 import org.chromium.chrome.browser.metrics.LaunchMetrics;
@@ -58,7 +59,11 @@ public class WebappLauncherActivity extends Activity {
                     webappMacString == null ? null : Base64.decode(webappMacString, Base64.DEFAULT);
 
             Intent launchIntent = null;
-            if (webappMac != null && WebappAuthenticator.isUrlValid(this, webappUrl, webappMac)) {
+            boolean isTrusted = IntentHandler.wasIntentSenderChrome(intent,
+                    ApplicationStatus.getApplicationContext());

[gone, 2016/04/07 19:10:44]

Indentation is wonky here (indent by 8 then 4).  Would be nice if you could pull
out the second half of the conditional, but I'm not sure how to do it nicely.

[dominickn, 2016/04/08 01:10:45]

I just used another variable. Seems a bit nicer this way rather than having the
huge conditional.

+            if (isTrusted
+                    || (webappMac != null
+                        && WebappAuthenticator.isUrlValid(this, webappUrl, webappMac))) {
                 LaunchMetrics.recordHomeScreenLaunchIntoStandaloneActivity(webappUrl, webappSource);
 
                 String activityName = WebappActivity.class.getName();