Add profiling_controller that manages profilers.

tools/perf/measurements/memory.py

Index: tools/perf/measurements/memory.py
diff --git a/tools/perf/measurements/memory.py b/tools/perf/measurements/memory.py
index f63cf3064a14505c77f4edb99ba8b55f739bd5f8..a692633420cae26125f2bd3193393f3ae640787f 100644
--- a/tools/perf/measurements/memory.py
+++ b/tools/perf/measurements/memory.py
@@ -34,7 +34,8 @@ class Memory(page_test.PageTest):
     self._memory_metric.AddResults(tab, results)
     self._power_metric.AddResults(tab, results)
 
-    if tab.browser.is_profiler_active('tcmalloc-heap'):
+    if tab.browser.platform.profiling_controller.is_profiler_active(

[tonyg, 2014/09/04 17:10:19]

This also seems like the wrong place for this. The Profiler itself should be
running this. Is that possible under the API these days?

[nednguyen, 2014/09/04 17:31:46]

Yeah, we leak the profiler API through the handles in browser object. Maybe this
optimization can be moved to tcmalloc_heap_profiler.WillCloseBrowser method,
wdyt?

+        'tcmalloc-heap'):
       # The tcmalloc_heap_profiler dumps files at regular
       # intervals (~20 secs).
       # This is a minor optimization to ensure it'll dump the last file when