WIP: Disable chromium metrics providers

chromium_src/chrome/browser/metrics/chrome_metrics_service_client.cc

@@ -0,0 +1,24 @@
+/* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#include "chrome/browser/metrics/chrome_metrics_service_client.h"
+
+#define ChromeMetricsServiceClient ChromeMetricsServiceClient_ChromiumImpl
+#include "src/chrome/browser/metrics/chrome_metrics_service_client.cc"
+#undef ChromeMetricsServiceClient
+
+void ChromeMetricsServiceClient::RegisterMetricsServiceProviders() {
+  // Do nothing.
+}
+
+void ChromeMetricsServiceClient::RegisterUKMProviders() {
+  // Do nothing.
+}
+
+ChromeMetricsServiceClient::ChromeMetricsServiceClient(
+    metrics::MetricsStateManager* state_manager,
+    variations::SyntheticTrialRegistry* synthetic_trial_registry)
+    : ChromeMetricsServiceClient_ChromiumImpl(state_manager,
+                                              synthetic_trial_registry) {}

chromium_src/chrome/browser/metrics/chrome_metrics_service_client.h

@@ -0,0 +1,32 @@
+/* Copyright (c) 2024 The Brave Authors. All rights reserved.
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at https://mozilla.org/MPL/2.0/. */
+#ifndef BRAVE_CHROMIUM_SRC_CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
+#define BRAVE_CHROMIUM_SRC_CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_
+
+#define ChromeMetricsServiceClient ChromeMetricsServiceClient_ChromiumImpl
+#define RegisterMetricsServiceProviders virtual RegisterMetricsServiceProviders
+#include "src/chrome/browser/metrics/chrome_metrics_service_client.h"  // IWYU pragma: export
+#undef RegisterMetricsServiceProviders
+#undef ChromeMetricsServiceClient
+
+class ChromeMetricsServiceClient
+    : public ChromeMetricsServiceClient_ChromiumImpl {
+ public:
+  void RegisterMetricsServiceProviders() override;
+  void RegisterUKMProviders() override;
+
+  ChromeMetricsServiceClient(
+      metrics::MetricsStateManager* state_manager,
+      variations::SyntheticTrialRegistry* synthetic_trial_registry);
+
+ private:
+  // TODO: remove?
+  friend class ChromeMetricsServiceClientTest;
+  friend class ChromeMetricsServiceClientTestIgnoredForAppMetrics;
+  friend class ChromeMetricsServiceClientTestWithoutUKMProviders;
+  FRIEND_TEST_ALL_PREFIXES(ChromeMetricsServiceClientTest, IsWebstoreExtension);
+};
+
+#endif  // BRAVE_CHROMIUM_SRC_CHROME_BROWSER_METRICS_CHROME_METRICS_SERVICE_CLIENT_H_

patches/chrome-browser-performance_manager-chrome_browser_main_extra_parts_performance_manager.cc.patch

@@ -0,0 +1,18 @@
+diff --git a/chrome/browser/performance_manager/chrome_browser_main_extra_parts_performance_manager.cc b/chrome/browser/performance_manager/chrome_browser_main_extra_parts_performance_manager.cc
+index 11548a8313dc775cb9bea3bc041d896e42ce305a..bbdced4ba79bd5722b74b0639e1c2bcfa7b6f250 100644
+--- a/chrome/browser/performance_manager/chrome_browser_main_extra_parts_performance_manager.cc
++++ b/chrome/browser/performance_manager/chrome_browser_main_extra_parts_performance_manager.cc
+@@ -310,11 +310,13 @@ void ChromeBrowserMainExtraPartsPerformanceManager::PreMainMessageLoopRun() {
+   performance_manager::user_tuning::UserPerformanceTuningManager::GetInstance()
+       ->Start();
+
++#if 0  // Disabled in Brave
+   // This object is created by the metrics service before threads, but it
+   // needs the UserPerformanceTuningManager to exist. At this point it's
+   // instantiated, but still needs to be initialized.
+   performance_manager::MetricsProviderDesktop::GetInstance()->Initialize();
+ #endif
++#endif
+ }
+
+ void ChromeBrowserMainExtraPartsPerformanceManager::PostMainMessageLoopRun() {