Add profiling_controller that manages profilers.

tools/telemetry/telemetry/core/platform/__init__.py

Index: tools/telemetry/telemetry/core/platform/__init__.py
diff --git a/tools/telemetry/telemetry/core/platform/__init__.py b/tools/telemetry/telemetry/core/platform/__init__.py
index 7cc35a650405c17130c70f2d864fcfe33c268adc..8737e423f07d23ab2ac596f282c826f117d5a816 100644
--- a/tools/telemetry/telemetry/core/platform/__init__.py
+++ b/tools/telemetry/telemetry/core/platform/__init__.py
@@ -4,6 +4,7 @@
 
 import sys
 
+from telemetry.core.platform import profiling_controller
 from telemetry.core.platform import tracing_controller
 
 
@@ -47,11 +48,17 @@ class Platform(object):
     self._platform_backend.SetPlatform(self)
     self._tracing_controller = tracing_controller.TracingController(
         self._platform_backend.tracing_controller_backend)
+    self._profiling_controller = profiling_controller.ProfilingController(
+        self._platform_backend.profiling_controller_backend)
 
   @property
   def tracing_controller(self):
     return self._tracing_controller
 
+  @property
+  def profiling_controller(self):
+    return self._profiling_controller
+
   def IsRawDisplayFrameRateSupported(self):
     """Platforms may be able to collect GL surface stats."""
     return self._platform_backend.IsRawDisplayFrameRateSupported()