android_webview: Build against NDK prebuilts, not system libraries.

android_webview: Build against NDK prebuilts, not system libraries.

To allow the chromium WebView to build unbundled, we need to stop
linking to system libraries and instead link to the prebuilt libraries
in the NDK.

This change rolls gyp to include the required makefile generation
changes, and adjusts the chromium side to match:

1) Stop setting use_system_stlport and instead use the NDK stlport by
   specifying LOCAL_NDK_STL_VARIANT := stlport_static

2) Remove support for the use_system_stlport flag entirely as WebView
   was the only user.

3) Don't try to link standard libraries like -lc -lm as the NDK does
   this automatically.

4) Don't include the OpenAL headers from frameworks/wilhelm; these are
   already part of the NDK with no special include path needed.

BUG=409851
Committed: https://crrev.com/3bc122f4da5cecfc6ffac44bce3fddf432afa174
Cr-Commit-Position: refs/heads/master@{#300212}

[Torne, 2014-09-15 14:35:35]

torne@chromium.org changed reviewers:
+ benm@chromium.org, brettw@chromium.org, primiano@chromium.org

[Torne, 2014-09-15 14:35:36]

+primiano, benm for general review
+brettw for .gn changes

This change is not ready to land as it needs to also roll gyp to include
https://codereview.chromium.org/571053003/ but since this is a two-sided patch
that must be landed together I wanted to send both out for review.

I'm sending it to trybots: it should be a no-op for all bots other than
android_aosp (which will be broken due to the missing gyp roll).

[Primiano Tucci (use gerrit), 2014-09-15 15:22:50]

LGTM.
Note that for some mysterious reason NaCL ended up copying some gyp/gn files. As
a matter of facts they have traces of 
similar use_system_stlport logic in 
src/native_client/build/config/compiler/BUILD.gn
and
src/native_client/build/config/android/config.gni

[Torne, 2014-09-15 15:27:28]

On 2014/09/15 15:22:50, Primiano Tucci wrote:
> LGTM.
> Note that for some mysterious reason NaCL ended up copying some gyp/gn files.
As
> a matter of facts they have traces of 
> similar use_system_stlport logic in 
> src/native_client/build/config/compiler/BUILD.gn
> and
> src/native_client/build/config/android/config.gni

Not sure if those are copied from chromium on an ongoing basis or not. We don't
build nacl support on WebView so it shouldn't matter; we can clean it up later
(it's a separate repo).

[brettw, 2014-09-16 22:44:22]

.gn lgtm

[Torne, 2014-10-17 18:00:10]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2014-10-17 18:01:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/571953002/40001

[commit-bot: I haz the power, 2014-10-17 18:33:46]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-17 18:33:50]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_arm64_d...)

[Torne, 2014-10-18 10:14:13]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2014-10-18 10:15:16]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/571953002/60001

[commit-bot: I haz the power, 2014-10-18 11:10:27]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2014-10-18 11:11:15]

Patchset 4 (id:??) landed as
https://crrev.com/3bc122f4da5cecfc6ffac44bce3fddf432afa174
Cr-Commit-Position: refs/heads/master@{#300212}