Add WebKit/common directory

No BUILD.gn for now as it doesn't have actual files yet, but
I plan to add that in the next patch.

Bug: 740070
Change-Id: I6e45e864f84a27561718a144fe51bd902482ae59
Reviewed-on: https://chromium-review.googlesource.com/566794
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488596}

content/browser/DEPS

@@ -139,6 +139,11 @@ include_rules = [
   "+third_party/WebKit/public/web/WebTreeScopeType.h",
   "+third_party/WebKit/public/web/WebTriggeringEventInfo.h",
 
+  # Unlike other WebKit directories WebKit/common is for the files that
+  # are commonly referenced by renderer-side and browser-side code, and
+  # does not use Blink types like WTF.
+  "+third_party/WebKit/common",
+
   # DO NOT ADD ANY CHROME OR COMPONENTS INCLUDES HERE!!!
   # See https://sites.google.com/a/chromium.org/dev/developers/content-module
   # for more information.

third_party/WebKit/Source/DEPS

@@ -6,6 +6,7 @@ include_rules = [
     "+services/service_manager/public/cpp/interface_provider.h",
     "+testing/gmock/include/gmock",
     "+testing/gtest/include/gtest",
+    "+third_party/WebKit/common",
     "+v8",
 ]
 

third_party/WebKit/common/DEPS

+include_rules = [
+    # In general this directory should not depend on any of components/,
+    # content/ or other third_party/WebKit directories.
+    "-components",
+    "-content",
+    "-third_party/WebKit",
+
+    # It is allowed to depend on common chromium stuff (and itself).
+    "+base",
+    "+third_party/WebKit/common",
+    "+build",
+    "+testing/gmock/include/gmock",
+    "+testing/gtest/include/gtest",
+]

third_party/WebKit/common/OWNERS

+jam@chromium.org
+haraken@chromium.org
+kinuko@chromium.org
+tkent@chromium.org
+jbroman@chromium.org
+
+# COMPONENT: Blink

third_party/WebKit/common/README.md

+# Blink 'common' directory
+
+This directory contains the common Web Platform stuff that needs to be shared by renderer-side and browser-side code.
+
+Things that live in third_party/WebKit/Source and browser-side code (e.g. content/browser for the time being) can both depend on this directory, while anything in this directory should NOT depend on them.
+
+Unlike other directories in WebKit, code in this directory cannot use Blink specific types like WTF, but should use common chromium types.