Enable profiler by default on Android, and reduce profiler sampling rate for An droid, ARM and MIPS.

runtime/vm/profiler.cc

Index: runtime/vm/profiler.cc
diff --git a/runtime/vm/profiler.cc b/runtime/vm/profiler.cc
index e262c6084b40c2a9f00105713ddbe5acb205fcc3..c6359a907a56ca63e7989592569d1ee59b55d661 100644
--- a/runtime/vm/profiler.cc
+++ b/runtime/vm/profiler.cc
@@ -24,15 +24,16 @@
 
 namespace dart {
 
-
-#if defined(TARGET_OS_ANDROID) || defined(HOST_ARCH_ARM64)

[rmacnak, 2015/04/27 21:06:18]

Why host?

[Cutch, 2015/04/27 21:19:52]

I think Zach had disabled this early in development of ARM64.

-  DEFINE_FLAG(bool, profile, false, "Enable Sampling Profiler");
+DEFINE_FLAG(bool, profile, true, "Enable Sampling Profiler");
+DEFINE_FLAG(bool, trace_profiled_isolates, false, "Trace profiled isolates.");
+#if defined(TARGET_OS_ANDROID) || defined(TARGET_ARCH_ARM64) ||                \
+    defined(TARGET_ARCH_ARM) || defined(TARGET_ARCH_MIPS)
+  DEFINE_FLAG(int, profile_period, 10000,
+              "Time between profiler samples in microseconds. Minimum 50.");
 #else
-  DEFINE_FLAG(bool, profile, true, "Enable Sampling Profiler");
+  DEFINE_FLAG(int, profile_period, 1000,
+              "Time between profiler samples in microseconds. Minimum 50.");
 #endif
-DEFINE_FLAG(bool, trace_profiled_isolates, false, "Trace profiled isolates.");
-DEFINE_FLAG(int, profile_period, 1000,
-            "Time between profiler samples in microseconds. Minimum 50.");
 DEFINE_FLAG(int, profile_depth, 8,
             "Maximum number stack frames walked. Minimum 1. Maximum 255.");
 #if defined(PROFILE_NATIVE_CODE) || defined(USING_SIMULATOR)