Make Android Clipboard Keep Track of Last Modified Time

And expose it the C++ code.

To do in a later changelist: add lightweight code to store the hash and update time in prefs so that Chrome can have a better chance of using the current clipboard content on startup.  (If the clipboard content hasn't changed since the last time Chrome ran, the last modified date is likely correct.)

BUG=682446

Review-Url: https://codereview.chromium.org/2766623003
Cr-Commit-Position: refs/heads/master@{#461234}


CrOS-Libchrome-Original-Commit: 6f6d07f111d9df9bc70ff3dc71612d940d9b2d17
1 file changed
tree: dd41fe5d0e9b745f59a9954b5b6abd0abb498452
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/