Stability instrumentation: add a Vectored Exception Handler

components/browser_watcher/stability_report.proto

 // 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.
 
 syntax = "proto2";
 
 option optimize_for = LITE_RUNTIME;
 
 package browser_watcher;
 
@@ skipping 124 matching lines @@
 
   // An arbitrary value used for information purposes.
   optional int32 generic_data = 13;
 
   // Tag id 10 is reserved for server side augmentation.
 
   // A key-value store.
   map<string, TypedValue> user_data = 9;
 }
 
+// Details about an exception.
+// Next id: 5
+message Exception {
+  optional uint32 code = 1;
+  optional uint64 program_counter = 2;
+  optional uint64 exception_address = 3;
+  optional int64 time = 4;
+}
+
 // The state of a thread.
-// Next id: 5
+// Next id: 6
 message ThreadState {
   // The name of the thread, up to a maxiumum length.
   optional string thread_name = 1;
 
   // The identifier of the thread.
   optional int64 thread_id = 2;
 
   // The activity stack. |activity_count| specifies the number of activities on
   // stack and |activities| holds the base of the stack (up to a maximum size).
   optional int32 activity_count = 3;
   repeated Activity activities = 4;
+
+  // The last exception to be successfully captured. Note this exception may
+  // have been recovered from.
+  optional Exception exception = 5;
 }
 
 // The state of a process.
 // Next id: 4
 message ProcessState {
   // The identifier of the process.
   optional int64 process_id = 3;
 
   // Note: likely only a subset of modules of interest (e.g. Chromium's own
   // modules).
@@ skipping 33 matching lines @@
   //     command line, etc.
   repeated ProcessState process_states = 2;
   // TODO(manzagop): if/when reports contain multiple processes, attribute and
   //     relocate these to their process (and perhaps thread).
   repeated string log_messages = 3;
   map<string, TypedValue> global_data = 4;
 
   // The field trials the user is currently enrolled in.
   repeated FieldTrial field_trials = 5;
 }