Add a Mojo EDK for Chrome that uses one OS pipe per message pipe.

chrome/browser/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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//third_party/protobuf/proto_library.gni")
 
@@ skipping 296 matching lines @@
       "//mojo/environment:chromium",
       "//net:extras",
       "//net:net_with_v8",
       "//storage/browser",
       "//storage/common",
       "//third_party/WebKit/public:image_resources",
       "//third_party/WebKit/public:resources",
       "//third_party/leveldatabase",
       "//third_party/libaddressinput",
       "//third_party/libyuv",
-      "//third_party/mojo/src/mojo/edk/system",
       "//third_party/mojo/src/mojo/public/cpp/bindings",
       "//third_party/mojo/src/mojo/public/js",
       "//third_party/re2",
       "//third_party/smhasher:cityhash",
       "//third_party/webrtc/modules/desktop_capture",
       "//ui/base/ime",
       "//ui/gl",
       "//ui/resources",
       "//ui/surface",
       "//ui/web_dialogs",
       "//v8",
     ]
 
+    if (use_chrome_edk) {

[Ken Rockot(use gerrit already), 2015/09/23 22:32:17]

What if we added a few new group targets to //mojo/BUILD.gn to encompass these
conditional deps. I think it'd be nice to isolate usage of use_chrome_edk as
much as possible since we're almost certainly going to remove it some day.

Seems it's used most often for //mojo/edk/system, test runners, and
test_support. We could add a //mojo rule like

group("edk_system") {
  // logic to depend on either //mojo or //third_party based on flag
}

and then just depend on //mojo:edk_system here and everywhere else

Then someday when only the chrome EDK exists, cleanup is a simple find and
replace //mojo:edk_system -> //mojo/edk/system. This would also apply to rules
for run_all_unittests and test_support.


On a related note: several build files which reference use_chrome_edk now are
not importing features.gni and this makes GN sad. Of course that problem goes
away if we consolidate these conditional deps as suggested above.

+      deps += [ "//mojo/edk/system" ]
+    } else {
+      deps += [ "//third_party/mojo/src/mojo/edk/system" ]
+    }
+
     if (toolkit_views) {
       deps += [ "//ui/views" ]
     }
   } else {  # iOS
     sources +=
         rebase_path(gypi_values.chrome_browser_ios_sources, ".", "//chrome")
     sources +=
         rebase_path(gypi_values.chrome_browser_google_sources, ".", "//chrome")
     deps += [ "//net" ]
     libs += [
@@ skipping 910 matching lines @@
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
       "//components/google/core/browser",
       "//components/omnibox/browser",
       "//components/rlz",
       "//components/search_engines",
       "//rlz:rlz_lib",
     ]
   }
 }