Make VideoCapturerAndroid work on SDK level 16

VideoCapturerAndroid, only you SurfaceViewHelper when capturing to textures.
SurfaceViewHelper requires EGL14 that was added in API level 17. Since the SurfaceViewHelper is only neeed when we capture to textures, this cl change back to not use it when we are capturing to byte buffers.

Also, thread.quitsafely was added in level 18. Instead a new ThreadUtil method has been added for this.

BUG=b/24782220
TEST = run
ninja -C out/Debug libjingle_peerconnection_android_unittest && CHECKOUT_SOURCE_ROOT=`pwd` build/android/adb_install_apk.py --debug out/Debug/apks/libjingle_peerconnection_android_unittest.apk && ./third_party/android_tools/sdk/platform-tools/adb shell am instrument -w -e class org.webrtc.VideoCapturerAndroidTest org.webrtc.test/android.test.InstrumentationTestRunner on a device running Android 4.1 (I tried Nexus 7, the first version)

Committed: https://crrev.com/73f44f6481b2a767c80693224ec3b334c26bc4e7
Cr-Commit-Position: refs/heads/master@{#10265}

[perkj_webrtc, 2015-10-11 16:31:45]

perkj@webrtc.org changed reviewers:
+ magjed@webrtc.org

[perkj_webrtc, 2015-10-11 16:31:46]

please?

[magjed_webrtc, 2015-10-13 14:16:51]

lgtm if this is a temporary fix

[perkj_webrtc, 2015-10-13 14:32:41]

The CQ bit was checked by perkj@webrtc.org

[commit-bot: I haz the power, 2015-10-13 14:32:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1401023003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1401023003/20001

[commit-bot: I haz the power, 2015-10-13 15:15:09]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-13 15:15:23]

Patchset 2 (id:??) landed as
https://crrev.com/73f44f6481b2a767c80693224ec3b334c26bc4e7
Cr-Commit-Position: refs/heads/master@{#10265}