IPC: Make ipc_perftests run on Android.

ipc/ipc_perftests.cc

Index: ipc/ipc_perftests.cc
diff --git a/ipc/ipc_perftests.cc b/ipc/ipc_perftests.cc
index e7eeab9d8ea455e19785b4afd87496c04c3c83b2..0b9a1eefd2c0dfb802136d6df98030e1d4d3f3cb 100644
--- a/ipc/ipc_perftests.cc
+++ b/ipc/ipc_perftests.cc
@@ -231,7 +231,7 @@ TEST_F(IPCChannelPerfTest, Performance) {
   ASSERT_TRUE(StartClient());
 
   const size_t kMsgSizeBase = 12;
-  const int kMsgSizeMaxExp = 5;
+  const int kMsgSizeMaxExp = 3;
   int msg_count = 100000;

[viettrungluu, 2014/03/15 17:25:27]

You might consider lowering msg_count instead of lowering kMsgSizeMaxExp, or
making msg_count dependent on msg_size. (We mostly send small messages, but it's
also good to know the performance characteristics on bigger messages.)

(Currently, at max exp of 3, that's a msg_size of 1728. If that runs in an
acceptable amount of time, you can definitely send 1728 * 100000 bytes in an
acceptable amount of time. So msg_count = 1728 * 100000 / msg_size would be
plausible for larger messages. It might be too big for smaller messages.)

[epenner, 2014/03/17 20:24:53]

Good point.

Okay I kept all 5 message sizes. I simply put all the sizes/counts into arrays.
Let me know if there is any issues, otherwise I'm going to land.

If I add more tests here I'll make it dynamic (ie 'run for 3 seconds').

   size_t msg_size = kMsgSizeBase;
   for (int i = 1; i <= kMsgSizeMaxExp; i++) {