[AndroidWebView] Add instrumentation test to catch StrictMode violations

android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java

Index: android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
diff --git a/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java b/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
index cb4e8b096da8030cb36537f2486c02501c585455..bd76a45cad3dffed113ecfabb992c275c37aee93 100644
--- a/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
+++ b/android_webview/javatests/src/org/chromium/android_webview/test/AwTestBase.java
@@ -10,8 +10,10 @@ import android.app.Instrumentation;
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.os.Build;
+import android.util.AndroidRuntimeException;
 import android.util.Log;
 
+
 import org.chromium.android_webview.AwBrowserContext;
 import org.chromium.android_webview.AwBrowserProcess;
 import org.chromium.android_webview.AwContents;
@@ -80,8 +82,9 @@ public class AwTestBase
 
     @Override
     protected void setUp() throws Exception {
-        Context appContext = getInstrumentation().getTargetContext().getApplicationContext();
-        mBrowserContext = new AwBrowserContext(new InMemorySharedPreferences(), appContext);
+        if (needsAwBrowserContextCreated()) {
+            createAwBrowserContext();
+        }
 
         super.setUp();
         if (needsBrowserProcessStarted()) {
@@ -89,6 +92,14 @@ public class AwTestBase
         }
     }
 
+    protected void createAwBrowserContext() {
+        if (mBrowserContext != null) {
+            throw new AndroidRuntimeException("There should only be one browser context.");
+        }
+        Context appContext = getInstrumentation().getTargetContext().getApplicationContext();
+        mBrowserContext = new AwBrowserContext(new InMemorySharedPreferences(), appContext);
+    }
+
     protected void startBrowserProcess() throws Exception {
         // The activity must be launched in order for proper webview statics to be setup.
         getActivity();
@@ -101,6 +112,14 @@ public class AwTestBase
     }
 
     /**
+     * Override this to return false if the test doesn't want to create an AwBrowserContext
+     * automatically.
+     */
+    protected boolean needsAwBrowserContextCreated() {
+        return true;
+    }
+
+    /**
      * Override this to return false if the test doesn't want the browser startup sequence to
      * be run automatically.
      * @return Whether the instrumentation test requires the browser process to already be started.