Support InputMethodManager#updateCursorAnchorInfo for Android 5.0 (C++ version)

Support InputMethodManager#updateCursorAnchorInfo for Android 5.0 (C++ version)

This is the 4th part of the series of CLs to enable
InputMethodManager#updateCursorAnchorInfo support for Android 5.0.

Here are previous CLs:
- part1 crrev.com/671503005
- part2 crrev.com/679223002
- part3 crrev.com/755853004
- part4 crrev.com/784503002
- part5 crrev.com/757233003

Basically this CL consists of following 6 parts.

1. Implements native wrapper for CursorAnchorInfo.Builder APIs
   so that we can implement that functionality in native side as
   much as possible.
2. Exposes View#GetLocationOnScreen to native side.
3. Adds CursorAnchorInfoController as a native class that manages
   when and how CursorAnchorInfo object should be built and sent
   to the IME. 
4. Adds tests for CursorAnchorInfoController.
5. Update IME API wrappers so that we can call new IME APIs for L
   from the native side.
6. Introduces --enable-cursor-anchor-info so that we can start
   testing this functionality behind the flag.

As discussed in the previous CLs, that callback is called in
Android 5.0 and later. Hence no performance impact is intended
in KitKat and prior.

Design Doc: https://docs.google.com/a/chromium.org/document/d/1KdnoynGURrJBP1vDHcv2jwUdnsXHzRSxb5v4rK7UgtU/view

BUG=424866
TEST=Manually done on Nexus 7 Build/LRX21P

[Torne, 2014-10-23 16:49:27]

torne@chromium.org changed reviewers:
+ torne@chromium.org

[Torne, 2014-10-23 16:49:28]

This should hopefully now build on android_aosp as I have rolled our SDK to 21.

[yukawa, 2014-10-23 18:35:27]

On 2014/10/23 16:49:28, Torne wrote:
> This should hopefully now build on android_aosp as I have rolled our SDK to
21.

Thanks Torne!  But seems that ProGuard still is not happy.  Is it expected?

[Torne, 2014-10-24 09:56:00]

On 2014/10/23 18:35:27, yukawa wrote:
> On 2014/10/23 16:49:28, Torne wrote:
> > This should hopefully now build on android_aosp as I have rolled our SDK to
> 21.
> 
> Thanks Torne!  But seems that ProGuard still is not happy.  Is it expected?

Ah; turns out I'm wrong. The code will compile, but the next step of the build
is to combine it with the glue layer into an APK, and this APK is being compiled
against the current AOSP master still (it can't compile against the SDK as it
uses hidden APIs). So no, this actually can't land until L is released to AOSP
and we've rolled the aosp bot to a version that includes the new framework :/

[yukawa, 2014-10-30 11:52:58]

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[yukawa, 2014-11-27 03:29:56]

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[Torne, 2014-11-27 14:53:39]

We've rolled android_aosp and this should now work; you should send it through
the trybots again to check.

[yukawa, 2014-12-01 15:00:11]

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[Torne, 2015-06-09 11:56:24]

torne@chromium.org changed reviewers:
- torne@chromium.org