Fix video slow to appear on first launch.

Fix video slow to appear on first launch.

BUG=webrtc:7777
Review-Url: https://codereview.webrtc.org/3006453002
Cr-Commit-Position: refs/heads/master@{#19497}
Committed: https://chromium.googlesource.com/external/webrtc/+/837adc087190b9b669ac67a5efde41a1de1c1571

[jtt_webrtc, 2017-08-23 16:38:40]

jtteh@webrtc.org changed reviewers:
+ denicija@webrtc.org, tkchin@webrtc.org

[jtt_webrtc, 2017-08-23 16:38:41]

Verified that webrtc:7777 is still fixed by setting fps = 15 in AppRTCMobile
before calling [_capturer startCaptureWithDevice:device ...] and viewing the HUD
and logs.

Logs:
000:645] [5123] (RTCLogging.mm:31): (RTCCameraVideoCapturer.m:128
-[RTCCameraVideoCapturer startCaptureWithDevice:format:fps:]_block_invoke):
startCaptureWithDevice <AVCaptureDeviceFormat: 0x17000d330 'vide'/'420v'  640x
480, { 2- 30 fps}, HRSI:3088x2320, fov:54.201, max zoom:145.00 (upscales @4.82),
ISO:23.0-2208.0, SS:0.000013-0.500000> @ 15 fps
[038:579] [36611] (webrtcvideoengine.cc:1996): VideoSendStream stats: 137573676,
{input_fps: 14, encode_fps: 15, encode_ms: 7, encode_usage_perc: 20, target_bps:
1700000, media_bps: 1569128, preferred_media_bitrate_bps: 1700000, suspended:
false, bw_adapted: false} {ssrc: 3858428599, width: 640, height: 480, key: 1,
delta: 558, total_bps: 1570568, retransmit_bps: 0, avg_delay_ms: 19,
max_delay_ms: 31, cum_loss: 0, max_ext_seq: 11229, nack: 0, fir: 0, pli: 0}
[038:579] [36611] (webrtcvideoengine.cc:2478): VideoReceiveStream stats:
137573676, {ssrc: 3858428599, total_bps: 1544848, width: 640, height: 480, key:
1, delta: 558, network_fps: 15, decode_fps: 15, render_fps: 15, decode_ms: 3,
max_decode_ms: 6, cur_delay_ms: 43, targ_delay_ms: 43, jb_delay_ms: 27,

[daniela-webrtc, 2017-08-24 07:59:36]

lgtm

[jtt_webrtc, 2017-08-24 13:42:33]

The CQ bit was checked by jtteh@webrtc.org

[commit-bot: I haz the power, 2017-08-24 13:42:43]

CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.webrtc.org/...

[commit-bot: I haz the power, 2017-08-24 14:14:36]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1503582153087420, "parent_rev":
"0860bee4026639f22acd53ea144731103f578448", "commit_rev":
"837adc087190b9b669ac67a5efde41a1de1c1571"}

[commit-bot: I haz the power, 2017-08-24 14:14:43]

Description was changed from

==========
Fix video slow to appear on first launch.

BUG=webrtc:7777
==========

to

==========
Fix video slow to appear on first launch.

BUG=webrtc:7777

Review-Url: https://codereview.webrtc.org/3006453002
Cr-Commit-Position: refs/heads/master@{#19497}
Committed:
https://chromium.googlesource.com/external/webrtc/+/837adc087190b9b669ac67a5e...
==========

[commit-bot: I haz the power, 2017-08-24 14:14:45]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/external/webrtc/+/837adc087190b9b669ac67a5e...