Added crashpad support for Windows

headless/app/headless_shell.cc

Index: headless/app/headless_shell.cc
diff --git a/headless/app/headless_shell.cc b/headless/app/headless_shell.cc
index 244d3381d508716c82746ff1659bc7684c27f349..244e36d27a726be8bf35f4ef4ff703f07c40938c 100644
--- a/headless/app/headless_shell.cc
+++ b/headless/app/headless_shell.cc
@@ -32,6 +32,8 @@
 #include "ui/gfx/geometry/size.h"
 
 #if defined(OS_WIN)
+#include "components/crash/content/app/crash_switches.h"
+#include "components/crash/content/app/run_as_crashpad_handler_win.h"
 #include "sandbox/win/src/sandbox_types.h"
 #endif
 
@@ -547,6 +549,15 @@ bool ValidateCommandLine(const base::CommandLine& command_line) {
 int HeadlessShellMain(HINSTANCE instance,
                       sandbox::SandboxInterfaceInfo* sandbox_info) {
   base::CommandLine::Init(0, nullptr);
+#if defined(HEADLESS_USE_CRASPHAD)
+  std::string process_type =
+      base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
+          ::switches::kProcessType);
+  if (process_type == crash_reporter::switches::kCrashpadHandler) {
+    return crash_reporter::RunAsCrashpadHandler(
+        *base::CommandLine::ForCurrentProcess(), ::switches::kProcessType);
+  }
+#endif  // defined(HEADLESS_USE_CRASPHAD)
   RunChildProcessIfNeeded(instance, sandbox_info);
   HeadlessBrowser::Options::Builder builder(0, nullptr);
   builder.SetInstance(instance);