Add support for component builds on Windows Swarming.

webrtc/base/BUILD.gn

Index: webrtc/base/BUILD.gn
diff --git a/webrtc/base/BUILD.gn b/webrtc/base/BUILD.gn
index 72564148a7984e7f8a2bf575ee712e75e6c37384..07dfc911a1575004fdae24cb894f58d18434a8a3 100644
--- a/webrtc/base/BUILD.gn
+++ b/webrtc/base/BUILD.gn
@@ -14,6 +14,9 @@ if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
+if (is_win) {
+  import("//build/config/win/visual_studio_version.gni")
+}
 
 config("rtc_base_approved_all_dependent_config") {
   if (is_mac && !build_with_chromium) {
@@ -195,6 +198,81 @@ rtc_static_library("rtc_base_approved") {
       "logging_mac.mm",
     ]
   }
+  if (is_component_build) {
+    # Copy the VS runtime DLLs into the isolate so that they don't have to be

[kjellander_webrtc, 2016/10/06 09:25:06]

Can you file a Type=Feature bug at crbug.com where you suggest the stuff added
in  https://codereview.chromium.org/1783973002 is moved out from src/build into
something in src/build so it's easier to use. It seems this is not really
Chromium-specific
Make sure to CC dpranke@ and brucedawson@ at it. 
Without that, this is surely going to cause problems in the future when
something changes regarding which files are needed.

Then add a TODO here about that we'd like to use that instead, referencing the
crbug.

+    # preinstalled on the target machine. The debug runtimes have a "d" at
+    # the end.
+    if (is_debug) {
+      vcrt_suffix = "d"
+    } else {
+      vcrt_suffix = ""
+    }
+
+    # These runtime files are copied to the output directory by the
+    # vs_toolchain script that runs as part of toolchain configuration.
+    if (visual_studio_version == "2015") {
+      data = [
+        "$root_out_dir/msvcp140${vcrt_suffix}.dll",
+        "$root_out_dir/vccorlib140${vcrt_suffix}.dll",
+        "$root_out_dir/vcruntime140${vcrt_suffix}.dll",
+
+        # Universal Windows 10 CRT files
+        "$root_out_dir/api-ms-win-core-console-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-datetime-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-debug-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-errorhandling-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-file-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-file-l1-2-0.dll",
+        "$root_out_dir/api-ms-win-core-file-l2-1-0.dll",
+        "$root_out_dir/api-ms-win-core-handle-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-heap-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-interlocked-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-libraryloader-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-localization-l1-2-0.dll",
+        "$root_out_dir/api-ms-win-core-memory-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-namedpipe-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-processenvironment-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-processthreads-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-processthreads-l1-1-1.dll",
+        "$root_out_dir/api-ms-win-core-profile-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-rtlsupport-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-string-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-synch-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-synch-l1-2-0.dll",
+        "$root_out_dir/api-ms-win-core-sysinfo-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-timezone-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-core-util-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-conio-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-convert-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-environment-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-filesystem-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-heap-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-locale-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-math-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-multibyte-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-private-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-process-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-runtime-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-stdio-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-string-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-time-l1-1-0.dll",
+        "$root_out_dir/api-ms-win-crt-utility-l1-1-0.dll",
+        "$root_out_dir/ucrtbase${vcrt_suffix}.dll",
+      ]
+    } else {
+      data = [
+        "$root_out_dir/msvcp120${vcrt_suffix}.dll",
+        "$root_out_dir/msvcr120${vcrt_suffix}.dll",
+      ]
+    }
+    if (is_asan) {
+      if (current_cpu == "x64") {
+        data += [ "$clang_base_path/lib/clang/$clang_version/lib/windows/clang_rt.asan_dynamic-x86_64.dll" ]
+      } else {
+        data += [ "$clang_base_path/lib/clang/$clang_version/lib/windows/clang_rt.asan_dynamic-i386.dll" ]
+      }
+    }
+  }
 }
 
 config("enable_libevent_config") {