[Not for review] Discardable memory emulation

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index ce8e95b0057bd512ca39ce5a30537fdc3b223bb3..80507adb0a171fac05a78db41f5d69b2618db45e 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -267,6 +267,7 @@
           'memory/discardable_memory.cc',
           'memory/discardable_memory.h',
           'memory/discardable_memory_android.cc',
+          'memory/discardable_memory_emulated.cc',
           'memory/discardable_memory_mac.cc',
           'memory/linked_ptr.h',
           'memory/manual_constructor.h',
@@ -773,6 +774,12 @@
               'sources/': [ ['exclude', '^win/'] ],
             },
           ],
+          ['OS == "android" or OS == "mac"', {
+              'sources!': [
+                'memory/discardable_memory_emulated.cc',
+              ],
+            },
+          ],
           ['OS != "android" or >(nacl_untrusted_build)==1', {
               'sources/': [ ['exclude', '^android/'] ],
             },