meta: Update breakpad/crashpad to 2021-12-03

CHANGELOG.md

@@ -1,11 +1,21 @@
 # Changelog
 
+## Unreleased
+
+**Features**
+
+- Add client-side stackwalking on Linux, Windows, and macOS (disabled by default).
+
 ## 0.4.12
 
 **Features**:
 
 - Make the shutdown timeout configurable via `sentry_options_set_shutdown_timeout`.
 
+**Internal**:
+
+- Update Crashpad and Breakpad submodules to 2021-12-03.
+
 **Fixes**:
 
 - The crashpad backend compiles with mingw again.

README.md

@@ -76,6 +76,7 @@ The SDK supports different features on the target platform:
   have the `curl` library available. On other platforms, library users need to
   implement their own transport, based on the `function transport` API.
 - **Crashpad Backend** is currently only supported on Linux, Windows and macOS.
+- **Client-side stackwalking** is currently only supported on Linux, Windows, and macOS.
 
 ## Building and Installation
 
@@ -265,6 +266,11 @@ Legend:
   Sets the sentry-native projects folder name for generators which support project hierarchy (like Microsoft Visual Studio).
   To use this feature you need to enable hierarchy via [`USE_FOLDERS` property](https://cmake.org/cmake/help/latest/prop_gbl/USE_FOLDERS.html) 
 
+- `CRASHPAD_ENABLE_STACKTRACE` (Default: OFF):
+  This enables client-side stackwalking when using the crashpad backend. Stack unwinding will happen on the client's machine
+  and the result will be submitted to Sentry attached to the generated minidump.
+  Note that this feature is still experimental.
+
 ### Build Targets
 
 - `sentry`: This is the main library and the only default build target.