Update cpu and memory metric calculation and several small improvements.

chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py

Index: chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
diff --git a/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py b/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
index b7ca295cda986adfbebe03302160d2a0f4b6d940..c44a8431c8622f79200d168df575ebfd30b7649a 100644
--- a/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
+++ b/chrome/test/media_router/telemetry/benchmarks/media_router_cpu_memory_metric.py
@@ -12,7 +12,7 @@ from metrics import Metric
 
 
 METRICS = {'privateMemory': {'units': 'MB', 'display_name': 'private_memory'},
-         'cpu': {'units': '%', 'display_name': 'cpu_utilization'}}
+           'cpu': {'units': '%', 'display_name': 'cpu_utilization'}}
 
 
 class MediaRouterCPUMemoryMetric(Metric):
@@ -41,11 +41,21 @@ class MediaRouterCPUMemoryMetric(Metric):
       for (process, process_results) in metric_results.iteritems():
         if not process_results:
           continue
-        avg_result = round(sum(process_results)/len(process_results), 4)
+        # Get rid of 0 values
+        non_zero_results = [result for result in process_results if result]
+        avg_result = round(sum(non_zero_results)/len(non_zero_results), 4)
         if metric == 'privateMemory':
           avg_result = round(avg_result/(1024 * 1024), 2)
         results.AddValue(scalar.ScalarValue(
             results.current_page,
-            '%s.%s' % (METRICS.get(metric).get('display_name'), process),
+            '%s_%s' % (METRICS.get(metric).get('display_name'), process),
             METRICS.get(metric).get('units'),
             avg_result))
+
+    # Calculate MR extension wakeup time
+    wakeup_percentage = round(
+        (len(perf_results['cpu']['mr_extension']) * 100 /
+         len(perf_results['cpu']['browser'])), 2)
+    results.AddValue(scalar.ScalarValue(
+            results.current_page, 'mr_extension_wakeup_percentage',
+            '%', wakeup_percentage))