Return a NULL histogram pointer on construction error

chrome/renderer/pepper/pepper_uma_host.cc

Index: chrome/renderer/pepper/pepper_uma_host.cc
diff --git a/chrome/renderer/pepper/pepper_uma_host.cc b/chrome/renderer/pepper/pepper_uma_host.cc
index ca9edc4bae5ce28ac1a7e88605ee270bfb56d102..7ecdcf9f3bac90204d0f52628ac945e1e5ff554c 100644
--- a/chrome/renderer/pepper/pepper_uma_host.cc
+++ b/chrome/renderer/pepper/pepper_uma_host.cc
@@ -112,7 +112,10 @@ int32_t PepperUMAHost::OnHistogramCustomTimes(
           base::TimeDelta::FromMilliseconds(max),
           bucket_count,
           base::HistogramBase::kUmaTargetedHistogramFlag);
-  counter->AddTime(base::TimeDelta::FromMilliseconds(sample));
+  // The histogram can be NULL if it is constructed with bad arguments.  Ignore
+  // that data for this API.  An error message will be logged.
+  if (counter)
+    counter->AddTime(base::TimeDelta::FromMilliseconds(sample));
   return PP_OK;
 }
 
@@ -135,7 +138,10 @@ int32_t PepperUMAHost::OnHistogramCustomCounts(
           max,
           bucket_count,
           base::HistogramBase::kUmaTargetedHistogramFlag);
-  counter->Add(sample);
+  // The histogram can be NULL if it is constructed with bad arguments.  Ignore
+  // that data for this API.  An error message will be logged.
+  if (counter)
+    counter->Add(sample);
   return PP_OK;
 }
 
@@ -156,7 +162,10 @@ int32_t PepperUMAHost::OnHistogramEnumeration(
           boundary_value,
           boundary_value + 1,
           base::HistogramBase::kUmaTargetedHistogramFlag);
-  counter->Add(sample);
+  // The histogram can be NULL if it is constructed with bad arguments.  Ignore
+  // that data for this API.  An error message will be logged.
+  if (counter)
+    counter->Add(sample);
   return PP_OK;
 }