Add WebAPK's tests in ChildProcessLauncherTest.

content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java

Index: content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java b/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
index 25bafd8c9f31eac1ef1fa9a3f9da910ca5a6a6b7..0aa52055caf7530dbce9cda135cef97ee82eee00 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ChildProcessLauncher.java
@@ -426,6 +426,14 @@ public class ChildProcessLauncher {
         return connection;
     }
 
+    private static ChildProcessConnection allocateConnection(Context context,

[no sievers, 2016/06/24 20:04:35]

nit: is this function really useful or can it be folded into the one you added
below?
so many 'allocate connection' functions in here :)

[Xi Han, 2016/06/24 21:21:31]

Done.

+            String[] commandLine, boolean inSandbox, boolean alwaysInForeground,
+            ChildProcessCreationParams creationParams) {
+        ChromiumLinkerParams chromiumLinkerParams = getLinkerParamsForNewConnection();
+        return allocateConnection(
+                context, inSandbox, chromiumLinkerParams, alwaysInForeground, creationParams);
+    }
+
     private static final long FREE_CONNECTION_DELAY_MILLIS = 1;
 
     private static void freeConnection(ChildProcessConnection connection) {
@@ -971,6 +979,12 @@ public class ChildProcessLauncher {
         return allocateBoundConnection(context, null, true, false, creationParams);
     }
 
+    @VisibleForTesting
+    static ChildProcessConnection allocateConnectionForTesting(Context context,
+            ChildProcessCreationParams creationParams) {
+        return allocateConnection(context, null, true, false, creationParams);
+    }
+
     /**
      * Queue up a spawn requests for testing.
      */