Mac: Loosen CoreAnimation blacklist on 10.10 and histograms to watch

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 83db601a945dd7665564f5fd87d09cd197867ac2..c352dbc93457111950d15ec083b01388d43f5567 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -17792,6 +17792,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GPU.IOSurface.CATransactionTime" units="ms">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    The time that it took to update the CALayer tree and commit the transaction.
+    This is often affected by IOSurface paging.
+  </summary>
+</histogram>
+
 <histogram name="GPU.IOSurface.CreateTime" units="ms">
   <owner>ccameron@chromium.org</owner>
   <summary>
@@ -17799,6 +17807,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="GPU.IOSurface.GLFlushTime" units="ms">
+  <owner>ccameron@chromium.org</owner>
+  <summary>
+    The time that it took for a call to glFlush to complete. This is often
+    affected by IOSurface paging.
+  </summary>
+</histogram>
+
 <histogram name="GPU.IOSurface.TexImageTime" units="ms">
   <owner>ccameron@chromium.org</owner>
   <summary>