Add sandbox support for AsanCoverage.

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index 0dac81d459486c2f04a8a862b9afedc92e47e284..28015aa5c5c77bd9849935afa31b3654a664811b 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -51,6 +51,10 @@
 #include "content/public/common/sandbox_init.h"
 #endif
 
+#if defined(ADDRESS_SANITIZER)
+#include <sanitizer/asan_interface.h>
+#endif
+
 const int kGpuTimeout = 10000;
 
 namespace content {
@@ -426,6 +430,14 @@ bool StartSandboxLinux(const gpu::GPUInfo& gpu_info,
     // has really been stopped.
     LinuxSandbox::StopThread(watchdog_thread);
   }
+
+#if defined(ADDRESS_SANITIZER)
+  LinuxSandbox* linux_sandbox = LinuxSandbox::GetInstance();
+  linux_sandbox->sanitizer_args()->coverage_sandboxed = 1;
+  linux_sandbox->sanitizer_args()->coverage_fd = -1;
+  linux_sandbox->sanitizer_args()->coverage_max_block_size = 0;
+#endif
+
   // LinuxSandbox::InitializeSandbox() must always be called
   // with only one thread.
   res = LinuxSandbox::InitializeSandbox();