Switch chrome_elf exception handling from breakpad to crashpad

chrome/common/child_process_logging_win.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/common/child_process_logging.h"
 
 #include <windows.h>
 
 #include <memory>
 
@@ skipping 11 matching lines @@
 // exported in breakpad_win.cc/crashpad_win.cc:
 //    void __declspec(dllexport) __cdecl SetCrashKeyValueImpl.
 typedef void(__cdecl* SetCrashKeyValue)(const wchar_t*, const wchar_t*);
 
 // exported in breakpad_win.cc/crashpad_win.cc:
 //    void __declspec(dllexport) __cdecl ClearCrashKeyValueImpl.
 typedef void(__cdecl* ClearCrashKeyValue)(const wchar_t*);
 
 void SetCrashKeyValueTrampoline(const base::StringPiece& key,
                                 const base::StringPiece& value) {
-  static SetCrashKeyValue set_crash_key = [](){
-    HMODULE exe_module = GetModuleHandle(chrome::kBrowserProcessExecutableName);
+  static SetCrashKeyValue set_crash_key = []() {
+    HMODULE elf_module = GetModuleHandle(chrome::kChromeElfDllName);
     return reinterpret_cast<SetCrashKeyValue>(
-        exe_module ? GetProcAddress(exe_module, "SetCrashKeyValueImpl")
+        elf_module ? GetProcAddress(elf_module, "SetCrashKeyValueImpl")
                    : nullptr);
   }();
   if (set_crash_key) {
     (set_crash_key)(base::UTF8ToWide(key).data(),
                     base::UTF8ToWide(value).data());
   }
 }
 
 void ClearCrashKeyValueTrampoline(const base::StringPiece& key) {
-  static ClearCrashKeyValue clear_crash_key = [](){
-    HMODULE exe_module = GetModuleHandle(chrome::kBrowserProcessExecutableName);
+  static ClearCrashKeyValue clear_crash_key = []() {
+    HMODULE elf_module = GetModuleHandle(chrome::kChromeElfDllName);
     return reinterpret_cast<ClearCrashKeyValue>(
-        exe_module ? GetProcAddress(exe_module, "ClearCrashKeyValueImpl")
+        elf_module ? GetProcAddress(elf_module, "ClearCrashKeyValueImpl")
                    : nullptr);
   }();
   if (clear_crash_key)
     (clear_crash_key)(base::UTF8ToWide(key).data());
 }
 
 }  // namespace
 
 void Init() {
-  crash_keys::RegisterChromeCrashKeys();
   base::debug::SetCrashKeyReportingFunctions(&SetCrashKeyValueTrampoline,
                                              &ClearCrashKeyValueTrampoline);
 
   // This would be handled by BreakpadClient::SetCrashClientIdFromGUID(), but
   // because of the aforementioned issue, crash keys aren't ready yet at the
   // time of Breakpad initialization, load the client id backed up in Google
   // Update settings instead.
+  // Please note if we are using Crashpad via chrome_elf then we need to call
+  // into chrome_elf to pass in the client id.
   std::unique_ptr<metrics::ClientInfo> client_info =
       GoogleUpdateSettings::LoadMetricsClientInfo();
-  if (client_info)
-    crash_keys::SetMetricsClientIdFromGUID(client_info->client_id);
+
+  // Set the client id in chrome_elf if it is loaded. We should not be
+  // registering crash keys in this case as that would already have been
+  // done by chrome_elf.
+  HMODULE elf_module = GetModuleHandle(chrome::kChromeElfDllName);
+  if (elf_module) {
+    // TODO(ananta)
+    // Remove this when the change to not require crash key registration lands.
+    // Please note that we are registering the crash keys twice if chrome_elf is
+    // loaded. Once in chrome_elf and once in the current module. Alternatively
+    // we could implement a crash key lookup trampoline which defers to
+    // chrome_elf. We decided to go with the duplicate key registration for
+    // simplicity.
+#if !defined(COMPONENT_BUILD)
+    crash_keys::RegisterChromeCrashKeys();
+#endif
+    using SetMetricsClientIdFunction = void (*)(const char* client_id);
+    SetMetricsClientIdFunction set_metrics_id_fn =
+        reinterpret_cast<SetMetricsClientIdFunction>(
+            ::GetProcAddress(elf_module, "SetMetricsClientId"));
+    DCHECK(set_metrics_id_fn);
+    set_metrics_id_fn(client_info ? client_info->client_id.c_str() : nullptr);
+  } else {
+    // TODO(ananta)
+    // Remove this when the change to not require crash key registration lands.
+    crash_keys::RegisterChromeCrashKeys();
+    if (client_info)
+      crash_keys::SetMetricsClientIdFromGUID(client_info->client_id);
+  }
 }
 
 }  // namespace child_process_logging