Add a variations parameter to control WebAPK renderer launching.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
index 360b52624cac92b4f4021ac8f1d2fbdeca45270c..20260d41f1e49486631e66c8396bac8a4def4824 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkActivity.java
@@ -30,6 +30,14 @@ import org.chromium.webapk.lib.client.WebApkServiceConnectionManager;
 public class WebApkActivity extends WebappActivity {
     /** Manages whether to check update for the WebAPK, and starts update check if needed. */
     private WebApkUpdateManager mUpdateManager;
+    /** Indicates whether to launch WebAPK renderer or not. */

[dominickn, 2017/02/23 00:17:28]

Nit: newline above this.

[F, 2017/02/23 01:15:42]

Done.

+    private boolean mCanLaunchWebApkRenderer;
+
+    public WebApkActivity() {
+        super();
+
+        mCanLaunchWebApkRenderer = ChromeWebApkHost.canLaunchWebApkRenderer();
+    }
 
     @Override
     protected void onNewIntent(Intent intent) {
@@ -155,14 +163,14 @@ public class WebApkActivity extends WebappActivity {
         // its AndroidManifest.xml. We set {@link ChildProcessCreationParams} for WebAPK's renderer
         // process so the {@link ChildProcessLauncher} knows which application's renderer
         // service to connect.
-        initializeChildProcessCreationParams(true);
+        initializeChildProcessCreationParams(mCanLaunchWebApkRenderer);
     }
 
     @Override
     protected void initializeChildProcessCreationParams() {
         // TODO(hanxi): crbug.com/611842. Investigates whether this function works for multiple
         // windows or with --site-per-process enabled.
-        initializeChildProcessCreationParams(true);
+        initializeChildProcessCreationParams(mCanLaunchWebApkRenderer);
     }
 
     @Override