Add an activity that allows whitelisted applications to clear all data in Chrome.

chrome/android/java_staging/AndroidManifest.xml

Index: chrome/android/java_staging/AndroidManifest.xml
diff --git a/chrome/android/java_staging/AndroidManifest.xml b/chrome/android/java_staging/AndroidManifest.xml
index 46a755f5c2415008077f25255c1965d262551766..8f29043491410f8befd3555dd82921379d8e17ab 100644
--- a/chrome/android/java_staging/AndroidManifest.xml
+++ b/chrome/android/java_staging/AndroidManifest.xml
@@ -350,6 +350,12 @@ by a child template that "extends" this file.
             android:excludeFromRecents="true">
         </activity>
 
+        <activity android:name="org.chromium.chrome.browser.childaccounts.ResetDataActivity"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar"

[palmer, 2015/06/17 21:55:17]

As declared, any other package on the device could invoke this Activity. Is that
safe/a good idea/intended?

There is a nice, declarative way to ensure that only the system or Chrome can
invoke the Activity: declare a signatureOrSystem Permission, and then require
that callers of this Activity must have it. Thus, only Chrome (or possibly other
Google packages) or the Android platform could launch the Activity.

http://developer.android.com/guide/topics/manifest/activity-element.html#prmsn

http://developer.android.com/guide/topics/manifest/permission-element.html

[Bernhard Bauer, 2015/06/18 09:08:53]

The problem with declaring a permission is that the permission has to be known
to the system before it can be granted to the app, which means that now Chrome
has to be installed before the app that calls this, which might not be the case.

Also, I think signatureOrSystem wouldn't work here, because the calling app is
signed with a different (but still first-party) key than Chrome is. At that
point, we'd have to whitelist a specific key... which is almost the same as I'm
doing here anyway :)

+            android:exported="true"
+            android:excludeFromRecents="true">
+        </activity>
+
         <activity android:name="org.chromium.chrome.browser.document.CipherKeyActivity"
             android:launchMode="singleInstance"
             android:theme="@android:style/Theme.Translucent.NoTitleBar"