Introduce a FlatMap and FlatSet into WTF

third_party/WebKit/Source/wtf/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.
 
 assert(!is_ios)
 
 import("//testing/test.gni")
 import("//third_party/WebKit/Source/config.gni")
 
 visibility = [
@@ skipping 58 matching lines @@
     "DataLog.cpp",
     "DataLog.h",
     "DateMath.cpp",
     "DateMath.h",
     "Deque.h",
     "DoublyLinkedList.h",
     "DynamicAnnotations.cpp",
     "DynamicAnnotations.h",
     "FilePrintStream.cpp",
     "FilePrintStream.h",
+    "FlatMap.h",
+    "FlatSet.h",
+    "FlatTable.h",
     "Forward.h",
     "Functional.h",
     "GetPtr.h",
     "HashCountedSet.h",
     "HashFunctions.h",
     "HashIterators.h",
     "HashMap.h",
     "HashSet.h",
     "HashTable.cpp",
     "HashTable.h",
@@ skipping 216 matching lines @@
 }
 
 test("wtf_unittests") {
   visibility = []  # Allow re-assignment of list.
   visibility = [ "*" ]
 
   sources = [
     "ASCIICTypeTest.cpp",
     "AssertionsTest.cpp",
     "DequeTest.cpp",
+    "FlatMapTest.cpp",
+    "FlatSetTest.cpp",
     "FunctionalTest.cpp",
     "HashMapTest.cpp",
     "HashSetTest.cpp",
     "ListHashSetTest.cpp",
     "MakeCancellableTest.cpp",
     "MathExtrasTest.cpp",
     "OptionalTest.cpp",
     "PassRefPtrTest.cpp",
     "RefPtrTest.cpp",
     "SaturatedArithmeticTest.cpp",
@@ skipping 31 matching lines @@
   configs += [ "//third_party/WebKit/Source:config" ]
 
   deps = [
     ":wtf",
     "//base",
     "//base/test:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }