Add MemoryLeakReportProto enum/field for type of process

components/metrics/proto/memory_leak_report.proto

Index: components/metrics/proto/memory_leak_report.proto
diff --git a/components/metrics/proto/memory_leak_report.proto b/components/metrics/proto/memory_leak_report.proto
index 65a40e5b249886fb0f521e454682bd3aa4dd0358..bbd2dbc7a6615b1e56585d67f08cb3cd8e1b2f19 100644
--- a/components/metrics/proto/memory_leak_report.proto
+++ b/components/metrics/proto/memory_leak_report.proto
@@ -8,7 +8,7 @@ option optimize_for = LITE_RUNTIME;
 
 package metrics;
 
-// Next tag: 5
+// Next tag: 6
 message MemoryLeakReportProto {
   // The call stack at which the leak was found. This is a list of offsets
   // within the program binary. The first entry is the deepest level of the call
@@ -61,6 +61,14 @@ message MemoryLeakReportProto {
   // Parameters used to initialize the leak detector.
   optional Params params = 3;
 
+  // The type of Chrome process on which this leak report was generated.
+  enum ProcessType {
+    UNKNOWN_PROCESS = 0;
+    BROWSER_PROCESS = 1;
+    RENDERER_PROCESS = 2;
+  }
+  optional ProcessType source_process = 5;
+
   //////////////////////////////////////////////////////////////////////////////
 
   // Represents a single snapshot of the internal bookkeeping of the Runtime