Add process lifetime annotations to stack samples.

components/metrics/public/interfaces/call_stack_profile_collector.mojom

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module metrics.mojom;
 
 import "mojo/common/common_custom_types.mojom";
 
 // These structs mirror the corresponding types in base::StackSamplingProfiler.
 
 struct CallStackModule {
   uint64 base_address;
   string id;
   mojo.common.mojom.FilePath filename;
 };
 
 struct CallStackFrame {
   uint64 instruction_pointer;
   uint64 module_index;
 };
 
+struct CallStackSample {
+  array<CallStackFrame> frames;
+  uint32 process_phases;
+};
+
 struct CallStackProfile {
   array<CallStackModule> modules;
-  array<array<CallStackFrame>> samples;
+  array<CallStackSample> samples;
   mojo.common.mojom.TimeDelta profile_duration;
   mojo.common.mojom.TimeDelta sampling_period;
 };
 
 enum Process {
   UNKNOWN_PROCESS,
   BROWSER_PROCESS,
   RENDERER_PROCESS,
   GPU_PROCESS,
   UTILITY_PROCESS,
@@ skipping 37 matching lines @@
   Thread thread;
   Trigger trigger;
   SampleOrderingSpec ordering_spec;
 };
 
 interface CallStackProfileCollector {
   Collect(CallStackProfileParams params,
           mojo.common.mojom.TimeTicks start_timestamp,
           array<CallStackProfile> profiles);
 };