Add new builder with enable_webrtc=false.

We want Chromium to build with enable_webrtc=false. I will initially
add a build bot in chromium.webrtc.

Bug: chromium:811678
Change-Id: If3f23a70f0102f5b65bb46e5e91eee3c0b1bbeb2
Reviewed-on: https://chromium-review.googlesource.com/960125
Commit-Queue: Patrik Höglund <phoglund@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544013}

testing/buildbot/chromium.webrtc.json

@@ -12,6 +12,11 @@
       "remoting_unittests"
     ]
   },
+  "Linux Builder (Chromium w/o WebRTC)": {
+    "additional_compile_targets": [
+      "chrome"
+    ]
+  },
   "Mac Builder": {
     "additional_compile_targets": [
       "browser_tests",

testing/buildbot/waterfalls.pyl

@@ -1911,6 +1911,11 @@
           'remoting_unittests',
         ],
       },
+      'Linux Builder (Chromium w/o WebRTC)': {
+        'additional_compile_targets': [
+          'chrome',
+        ],
+      },
       'Mac Builder': {
         'additional_compile_targets': [
           'browser_tests',

tools/mb/mb_config.pyl

@@ -481,6 +481,7 @@
 
     'chromium.webrtc': {
       'Linux Builder': 'release_bot_chrome_with_codecs',
+      'Linux Builder (Chromium w/o WebRTC)': 'release_bot_chrome_with_codecs_disable_webrtc',
       'Mac Builder': 'release_bot_chrome_with_codecs',
       'Win Builder': 'release_bot_x86_minimal_symbols_no_com_init_hooks',
     },
@@ -1523,6 +1524,10 @@
       'release_bot', 'chrome_with_codecs',
     ],
 
+    'release_bot_chrome_with_codecs_disable_webrtc': [
+      'release_bot', 'chrome_with_codecs', 'disable_webrtc',
+    ],
+
     'release_bot_enable_blink_heap_verification_dcheck_always_on': [
       'release_bot', 'enable_blink_heap_verification', 'dcheck_always_on',
     ],
@@ -1578,6 +1583,8 @@
       'release_bot_x86_minimal_symbols_disable_nacl', 'no_clang'
     ],
 
+
+
     'release_libfuzzer_asan': [
       'release', 'libfuzzer', 'asan', 'chromeos_codecs', 'pdf_xfa', 'disable_nacl', 'optimize_for_fuzzing',
     ],
@@ -1920,6 +1927,10 @@
       'gn_args': 'enable_nacl=false',
     },
 
+    'disable_webrtc': {
+      'gn_args': 'enable_webrtc=false',
+    },
+
     'edge': {
       'gn_args': 'sanitizer_coverage_flags="trace-pc-guard"',
     },