Use DiscardableMemoryManager on Android.

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index f2151b3521e061a2a74dcc62d53ce627658fab8f..06ad10bfb3c002c8cf60ad42641111d3a104120a 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -474,7 +474,6 @@
         'mac/scoped_sending_event_unittest.mm',
         'md5_unittest.cc',
         'memory/aligned_memory_unittest.cc',
-        'memory/discardable_memory_allocator_android_unittest.cc',
         'memory/discardable_memory_manager_unittest.cc',
         'memory/discardable_memory_unittest.cc',
         'memory/linked_ptr_unittest.cc',
@@ -756,6 +755,11 @@
             ['include', '^sys_string_conversions_mac_unittest\\.mm$'],
           ],
         }],
+        ['OS == "android" and _toolset == "target"', {

[willchan no longer on Chromium, 2014/04/30 06:38:21]

Can you explain why this is restricted to "target"? I am not familiar with this
conditional.

[Philippe, 2014/04/30 08:38:10]

David also asked about it in the first patch set. Let me paste my reply below:
On platforms where cross-compilation is used, we distinguish the target (Android
here) and the host (Linux). In an Android build we build libbase not only for
the target but also for the host since we have some standalone binaries
(depending on base) that we use as part of the build itself and for testing.

+          'sources': [
+            'memory/discardable_memory_ashmem_allocator_unittest.cc',
+          ],
+        }],
         ['OS == "android"', {
           'sources/': [
             ['include', '^debug/proc_maps_linux_unittest\\.cc$'],