Add experiments info to crash dumps.

chrome/app/breakpad_field_trial_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/app/breakpad_field_trial_win.h"
+
+#include "base/lazy_instance.h"
+#include "base/string_util.h"
+#include "base/string16.h"
+#include "base/stringprintf.h"
+#include "breakpad/src/client/windows/common/ipc_protocol.h"
+#include "chrome/app/breakpad_win.h"
+#include "chrome/common/child_process_logging.h"
+
+extern "C" void __declspec(dllexport) __cdecl SetExperimentList(
+    const std::vector<string16>& experiment_strings) {
+  // Make sure we were initialized before we start writing data
+  if (breakpad_win::g_experiment_chunks_offset == 0)
+    return;
+
+  size_t num_chunks = 0;
+  size_t current_experiment = 0;
+  string16 current_chunk(google_breakpad::CustomInfoEntry::kValueMaxLength, 0);
+  while (current_experiment < experiment_strings.size() &&
+         num_chunks < kMaxReportedExperimentChunks) {
+    // Check if we have enough room to add another experiment to the current
+    // chunk string. If not, we commit the current chunk string and start over.
+    if (current_chunk.size() + experiment_strings[current_experiment].size() >
+        google_breakpad::CustomInfoEntry::kValueMaxLength) {
+      base::wcslcpy(
+          (*breakpad_win::g_custom_entries)[
+              breakpad_win::g_experiment_chunks_offset + num_chunks].value,
+          current_chunk.c_str(),
+          current_chunk.size() + 1);  // This must include the NULL termination.
+      ++num_chunks;
+      current_chunk = experiment_strings[current_experiment];
+    } else {
+      if (!current_chunk.empty())
+        current_chunk += L",";
+      current_chunk += experiment_strings[current_experiment];
+    }
+    ++current_experiment;
+  }
+
+  // Commit the last chunk that didn't get big enough yet.
+  if (!current_chunk.empty() && num_chunks < kMaxReportedExperimentChunks) {
+    base::wcslcpy(
+        (*breakpad_win::g_custom_entries)[
+            breakpad_win::g_experiment_chunks_offset + num_chunks].value,
+        current_chunk.c_str(),
+        current_chunk.size() + 1);  // This must include the NULL termination.
+  }
+
+  // Make note of the total number of experiments,
+  // even if it's > kMaxReportedExperimentChunks. This is useful when
+  // correlating stability with the number of experiments running
+  // simultaneously.
+  base::wcslcpy(
+      (*breakpad_win::g_custom_entries)[
+          breakpad_win::g_num_of_experiments_offset].value,
+      base::StringPrintf(L"%d", experiment_strings.size()).c_str(),
+      google_breakpad::CustomInfoEntry::kValueMaxLength);
+}
+
+namespace testing {
+
+void SetExperimentList(const std::vector<string16>& experiment_strings) {
+  ::SetExperimentList(experiment_strings);
+}
+
+}  // namespace testing