Refactor webrtc_perf_tests into several source_sets.

webrtc/call/BUILD.gn

 # Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 
@@ skipping 57 matching lines @@
       "../modules/audio_mixer",
       "../test:test_common",
       "//testing/gmock",
       "//testing/gtest",
     ]
     if (!build_with_chromium && is_clang) {
       # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
       suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
     }
   }
+  rtc_source_set("call_perf_tests") {

[kjellander_webrtc, 2017/01/04 12:28:53]

+1 blank line before this target improves readability IMO

+    testonly = true
+    sources = [
+      "call_perf_tests.cc",
+      "rampup_tests.cc",
+      "rampup_tests.h",
+    ]
+    deps = [
+      "//testing/gtest",
+      "//webrtc/test:test_common",
+    ]
+    if (!build_with_chromium && is_clang) {
+      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
+      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
+    }
+  }
 }