Moving the GL implementation details into a sub folder for client display.

remoting/client/display/BUILD.gn

+# Copyright 2014 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("display") {
+  sources = [
+    "gl_canvas.cc",
+    "gl_canvas.h",
+    "gl_cursor.cc",
+    "gl_cursor.h",
+    "gl_cursor_feedback.cc",
+    "gl_cursor_feedback.h",
+    "gl_cursor_feedback_texture.cc",
+    "gl_cursor_feedback_texture.h",
+    "gl_desktop.cc",
+    "gl_desktop.h",
+    "gl_helpers.cc",
+    "gl_helpers.h",
+    "gl_math.cc",
+    "gl_math.h",
+    "gl_render_layer.cc",
+    "gl_render_layer.h",
+    "gl_renderer.cc",
+    "gl_renderer.h",
+  ]
+
+  deps = [
+    "//remoting/proto",
+    "//third_party/libyuv",
+    "//third_party/webrtc/base:rtc_base",
+  ]
+
+  configs += [ "//third_party/khronos:khronos_headers" ]
+
+  if (is_linux) {
+    libs = [ "GL" ]
+  }
+
+  if (is_mac) {
+    libs = [ "OpenGL.framework" ]
+  }
+
+  if (is_ios) {
+    libs = [
+      "GLKit.framework",
+      "OpenGLES.framework",
+    ]
+  }
+
+  if (is_win) {
+    deps += [ "//third_party/angle:libGLESv2" ]
+  }
+}
+
+source_set("unit_tests") {
+  testonly = true
+
+  sources = [
+    "gl_renderer_unittest.cc",
+  ]
+
+  configs += [
+    "//remoting/build/config:version",
+    "//remoting/build/config:enable_webrtc_remoting_client",
+  ]
+
+  deps = [
+    ":display",
+    "//remoting/client",
+    "//remoting/proto",
+    "//testing/gmock",
+    "//testing/gtest",
+    "//third_party/webrtc/base:rtc_base",
+  ]
+
+  if (is_win) {

[Yuwei, 2017/01/04 20:37:33]

It seems kind of weird to have a target with no source files if it's on Windows.
Alternatively you can try only depend on this in client:unit_tests if it is not
Windows.

[nicholss, 2017/01/04 20:51:24]

It really does not matter. The easiest solution is to have windows dep on an
empty target without logic on the deps side and if that changes then no changes
are required to undo that special logic.

+    # Windows clang builder fails to link the test binary with ANGLE GLESv2.
+    # crbug.com/642027
+    sources -= [ "gl_renderer_unittest.cc" ]
+    deps -= [ ":display" ]
+  }
+}