Allow sanitizer coverage to create *.sancov files when sandboxed

content/common/sandbox_win.cc

Index: content/common/sandbox_win.cc
diff --git a/content/common/sandbox_win.cc b/content/common/sandbox_win.cc
index 8398b798d06080dd6cd0e9281ad07005c95b49a8..1966145c36f5ccd0df877779eb8a6cedf2e24aac 100644
--- a/content/common/sandbox_win.cc
+++ b/content/common/sandbox_win.cc
@@ -9,6 +9,7 @@
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/profiler.h"
+#include "base/environment.h"
 #include "base/files/file_util.h"
 #include "base/hash.h"
 #include "base/metrics/sparse_histogram.h"
@@ -16,6 +17,7 @@
 #include "base/process/launch.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/trace_event/trace_event.h"
 #include "base/win/iat_patch_function.h"
 #include "base/win/scoped_handle.h"
@@ -356,6 +358,23 @@ bool AddGenericPolicy(sandbox::TargetPolicy* policy) {
     return false;
 #endif
 
+#if defined(SANITIZER_COVERAGE)
+  scoped_ptr<base::Environment> env(base::Environment::Create());
+  std::string coverage_dir;
+  if (!env->GetVar("SANITIZER_COVERAGE_DIR", &coverage_dir)) {
+    LOG(WARNING) << "SANITIZER_COVERAGE_DIR was not set, coverage won't work.";
+  } else {
+    base::FilePath sancov_path =
+        base::FilePath(base::UTF16ToWide(base::ASCIIToUTF16(coverage_dir)))
+            .Append(L"*.sancov");

[cpu_(ooo_6.6-7.5), 2015/05/01 17:18:58]

use the native environment function so you don't have to do all that scoped_ptr
+ utf16 conversion.

+    result = policy->AddRule(sandbox::TargetPolicy::SUBSYS_FILES,
+                             sandbox::TargetPolicy::FILES_ALLOW_ANY,
+                             sancov_path.value().c_str());
+    if (result != sandbox::SBOX_ALL_OK)
+      return false;
+  }
+#endif
+
   AddGenericDllEvictionPolicy(policy);
   return true;
 }