Prepare ClearBrowsingDataDialogFragment for browsing data counters.

chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BrowsingDataCounterBridge.java

Index: chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BrowsingDataCounterBridge.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BrowsingDataCounterBridge.java b/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BrowsingDataCounterBridge.java
new file mode 100644
index 0000000000000000000000000000000000000000..3c0a6553077b895b5506230737d5926a2f5bf1a2
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/preferences/privacy/BrowsingDataCounterBridge.java
@@ -0,0 +1,34 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.preferences.privacy;
+
+import org.chromium.base.annotations.CalledByNative;
+
+/**
+ * Communicates between BrowsingDataCounter (C++ backend) and ClearBrowsingDataFragment (Java UI).
+ */
+public class BrowsingDataCounterBridge {
+    private final long mNativeBrowsingDataCounterBridge;
+    private BrowsingDataCounterCallback mOwner;

[newt (away), 2016/01/12 18:55:26]

I'd be consistent with terminology and rename mOwner to mCallback.

[msramek, 2016/01/13 15:27:53]

Done.

+
+    public BrowsingDataCounterBridge(BrowsingDataCounterCallback owner, int dataType) {

[newt (away), 2016/01/12 18:55:26]

javadoc for all public methods

[msramek, 2016/01/13 15:27:53]

Done.

+        mOwner = owner;
+        mNativeBrowsingDataCounterBridge = nativeInit(dataType);
+    }
+
+    public void destroy() {
+        if (mNativeBrowsingDataCounterBridge != 0) {
+            nativeDestroy(mNativeBrowsingDataCounterBridge);

[newt (away), 2016/01/12 18:55:26]

set mNativeBrowsingDataCounterBridge to 0 after destroying it to prevent
accidental use-after-free

[msramek, 2016/01/13 15:27:53]

Done.

+        }
+    }
+
+    @CalledByNative
+    private void onBrowsingDataCounterFinished(String result) {
+        mOwner.onCounterFinished(result);
+    }
+
+    private native long nativeInit(int index);

[newt (away), 2016/01/12 18:55:26]

s/index/dataType/

[msramek, 2016/01/13 15:27:53]

Done.

+    private static native void nativeDestroy(long nativeBrowsingDataCounterBridge);

[newt (away), 2016/01/12 18:55:26]

make this non-static

[msramek, 2016/01/13 15:27:53]

Done.

+}