[Android] Introduce a Java wrapper for TemplateUrlService.

chrome/android/testshell/javatests/src/org/chromium/chrome/testshell/ChromiumTestShellTestBase.java

Index: chrome/android/testshell/javatests/src/org/chromium/chrome/testshell/ChromiumTestShellTestBase.java
diff --git a/chrome/android/testshell/javatests/src/org/chromium/chrome/testshell/ChromiumTestShellTestBase.java b/chrome/android/testshell/javatests/src/org/chromium/chrome/testshell/ChromiumTestShellTestBase.java
index 1c80486c65f20684b46ed90e7538aba55c706b93..6c44ea46848430c6100a6441fa10b836321e19f0 100644
--- a/chrome/android/testshell/javatests/src/org/chromium/chrome/testshell/ChromiumTestShellTestBase.java
+++ b/chrome/android/testshell/javatests/src/org/chromium/chrome/testshell/ChromiumTestShellTestBase.java
@@ -5,6 +5,7 @@
 package org.chromium.chrome.testshell;
 
 import android.content.ComponentName;
+import android.content.Context;
 import android.content.Intent;
 import android.net.Uri;
 import android.test.ActivityInstrumentationTestCase2;
@@ -14,6 +15,7 @@ import org.chromium.chrome.browser.TabBase;
 import org.chromium.content.browser.test.util.Criteria;
 import org.chromium.content.browser.test.util.CriteriaHelper;
 
+import java.io.File;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 /**
@@ -88,6 +90,84 @@ public class ChromiumTestShellTestBase extends
     }
 
     /**
+     * Clear all files in the testshell's directory except 'lib'.
+     *
+     * @return Whether clearing the application data was successful.
+     */
+    protected boolean clearAppData() throws Exception {
+        final int MAX_TIMEOUT_MS = 3000;
+        final String appDir = getAppDir();
+        return CriteriaHelper.pollForCriteria(
+                new Criteria() {
+                    private boolean mDataRemoved = false;
+                    @Override
+                    public boolean isSatisfied() {
+                        if (!mDataRemoved && !removeAppData(appDir)) {
+                            return false;
+                        }
+                        mDataRemoved = true;
+                        // We have to make sure the cache directory still exists, as the framework
+                        // will try to create it otherwise and will fail for sandbox processes with
+                        // an NPE.
+                        File cacheDir = new File(appDir, "cache");
+                        if (cacheDir.exists()) {
+                            return true;
+                        }
+                        return cacheDir.mkdir();
+                    }
+                },
+                MAX_TIMEOUT_MS, MAX_TIMEOUT_MS / 10);
+    }
+
+    /**
+     * Remove all files and directories under the given appDir except 'lib'
+     *
+     * @param appDir the app directory to remove.
+     *
+     * @return true if succeeded.
+     */
+    private boolean removeAppData(String appDir) {
+        File[] files = new File(appDir).listFiles();
+        if (files == null) {
+            return true;
+        }
+        for (File file : files) {
+            if (!file.getAbsolutePath().endsWith("/lib") && !removeFile(file)) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    private String getAppDir() {
+        Context target_ctx = getInstrumentation().getTargetContext();
+        String cacheDir = target_ctx.getCacheDir().getAbsolutePath();
+        return cacheDir.substring(0, cacheDir.lastIndexOf('/'));
+    }
+
+    /**
+     * Remove the given file or directory.
+     *
+     * @param file the file or directory to remove.
+     *
+     * @return true if succeeded.
+     */
+    private static boolean removeFile(File file) {
+        if (file.isDirectory()) {
+            File[] files = file.listFiles();
+            if (files == null) {
+                return true;
+            }
+            for (File sub_file : files) {
+                if (!removeFile(sub_file))
+                    return false;
+            }
+        }
+        return file.delete();
+    }
+
+
+    /**
      * Navigates the currently active tab to a sanitized version of {@code url}.
      * @param url The potentially unsanitized URL to navigate to.
      */