The test WebRtcMediaRecorderTest.StartWithTimeSlice seems to be flaky (on Builder Android Tests (dbg) (L Nexus5)) and it prevents WebRTC from finding an LKGR to roll into Chromium.

Example of failure:
https://ci.chromium.org/buildbot/chromium.webrtc.fyi/Android%20Tests%20%28dbg%29%20%28L%20Nexus5%29/28012

Example of success:
https://ci.chromium.org/buildbot/chromium.webrtc.fyi/Android%20Tests%20%28dbg%29%20%28L%20Nexus5%29/28020

Copy/paste of the log:
FINISHED TRY #3/3
I 1123.333s Main  1 failed tests remain.
C 1123.333s Main  ********************************************************************************
C 1123.333s Main  Detailed Logs
C 1123.333s Main  ********************************************************************************
C 1123.333s Main  [UNKNOWN] WebRtcMediaRecorderTest.StartWithTimeSlice/4:
C 1123.333s Main  [ RUN      ] WebRtcMediaRecorderTest.StartWithTimeSlice/4
C 1123.333s Main  [WARNING:dns_config_service_posix.cc(329)] Failed to read DnsConfig.
C 1123.334s Main  [ERROR:devtools_http_handler.cc(249)] Cannot start http server for devtools. Stop devtools.
C 1123.334s Main  [WARNING:child_process_launcher_helper_posix.cc(118)] Ignoring invalid file assets/snapshot_blob_64.bin
C 1123.334s Main  [WARNING:simple_synchronous_entry.cc(1164)] Could not open platform files for entry.
C 1123.334s Main  [ERROR:shell_android.cc(78)] Not implemented reached in void content::Shell::PlatformSetTitle(const base::string16 &): MediaStream Recoder Browser Test (w/ MediaSource)
C 1123.334s Main  [ERROR:platform_shared_buffer.cc(203)] Forcing region read-only before Mojo serialization
C 1123.334s Main  [INFO:CONSOLE(88)] "URL.createObjectURL with media streams is deprecated and will be removed in M68, around July 2018. Please use HTMLMediaElement.srcObject instead. See https://www.chromestatus.com/features/5618491470118912 for more details.", source: http://127.0.0.1:38559/media/mediarecorder_test.html (88)
C 1123.334s Main  [INFO:CONSOLE(90)] "Recorder object created, mimeType = video/webm;codecs=VP8", source: http://127.0.0.1:38559/media/mediarecorder_test.html (90)
C 1123.334s Main  [INFO:CONSOLE(93)] "Recorder started with time slice", source: http://127.0.0.1:38559/media/mediarecorder_test.html (93)
C 1123.334s Main  [INFO:CONSOLE(22)] "Waiting for", source: http://127.0.0.1:38559/media/mediarecorder_test_utils.js (22)
C 1123.334s Main  [INFO:SkFontMgr_android.cpp(164)] Requested font file /system/fonts/NanumGothic.ttf does not exist or cannot be opened.
C 1123.334s Main  
C 1123.334s Main  [INFO:SkFontMgr_android.cpp(164)] Requested font file /system/fonts/DroidSansFallback.ttf does not exist or cannot be opened.
C 1123.334s Main  
C 1123.334s Main  [ERROR:program_binding.cc(244)] Error compiling shader: 
C 1123.334s Main   shader program: #define TexCoordPrecision highp
C 1123.334s Main  attribute TexCoordPrecision vec4 a_position;
C 1123.334s Main  uniform mat4 matrix;
C 1123.334s Main  varying TexCoordPrecision vec2 v_uvTexCoord;
C 1123.334s Main  varying TexCoordPrecision vec2 v_yaTexCoord;
C 1123.334s Main  attribute TexCoordPrecision vec2 a_texCoord;
C 1123.334s Main  uniform TexCoordPrecision vec2 uvTexOffset;
C 1123.334s Main  uniform TexCoordPrecision vec2 uvTexScale;
C 1123.334s Main  uniform TexCoordPrecision vec2 yaTexOffset;
C 1123.334s Main  uniform TexCoordPrecision vec2 yaTexScale;
C 1123.334s Main  void main() {
C 1123.334s Main    // Compute the position.
C 1123.334s Main    vec4 pos = a_position;
C 1123.334s Main    gl_Position = matrix * pos;
C 1123.334s Main    // Compute texture coordinates.
C 1123.334s Main    vec2 texCoord = a_texCoord;
C 1123.334s Main    v_yaTexCoord = texCoord * yaTexScale + yaTexOffset;
C 1123.334s Main    v_uvTexCoord = texCoord * uvTexScale + uvTexOffset;
C 1123.334s Main  }
C 1123.334s Main  
C 1123.334s Main  [INFO:CONSOLE(30)] "Still waiting for satisfaction of function() {
C 1123.334s Main                return videoSize > 0 && timeStamps.length > 10;