[code coverage] Added Windows-specific path for sandbox file injection.

Also deleted an unnecessary include of unistd.h.

Bug: 990480
Change-Id: I5caa9a1dabcbb9e90bab1372bc38b8079c5a640e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1797644Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Sajjad Mirza <sajjadm@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695848}

content/child/child_thread_impl.cc

@@ -91,7 +91,9 @@
 
 #if BUILDFLAG(CLANG_COVERAGE)
 #include <stdio.h>
-#include <unistd.h>
+#if defined(OS_WIN)
+#include <io.h>
+#endif
 // Function provided by libclang_rt.profile-*.a, declared and documented at:
 // https://github.com/llvm/llvm-project/blob/master/compiler-rt/lib/profile/InstrProfiling.h
 extern "C" void __llvm_profile_set_file_object(FILE* File, int EnableMerge);
@@ -396,6 +398,11 @@ class ChildProcessImpl : public mojom::ChildProcess {
     int fd = file.TakePlatformFile();
     FILE* f = fdopen(fd, "r+b");
     __llvm_profile_set_file_object(f, 1);
+#elif defined(OS_WIN)
+    HANDLE handle = file.TakePlatformFile();
+    int fd = _open_osfhandle((intptr_t)handle, 0);
+    FILE* f = _fdopen(fd, "r+b");
+    __llvm_profile_set_file_object(f, 1);
 #endif
   }
 #endif

content/common/coverage_utils.cc

@@ -15,8 +15,11 @@
 #include "base/path_service.h"
 #include "base/rand_util.h"
 #include "base/strings/strcat.h"
+#include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_restrictions.h"
+#include "build/build_config.h"
 
 namespace content {
 
@@ -26,7 +29,11 @@ base::File OpenCoverageFile() {
   std::string prof_template;
   base::FilePath path;
   if (env->GetVar("LLVM_PROFILE_FILE", &prof_template)) {
+#if defined(OS_WIN)
+    path = base::FilePath(base::UTF8ToUTF16(prof_template)).DirName();
+#else
     path = base::FilePath(prof_template).DirName();
+#endif
     base::CreateDirectory(path);
   } else {
     base::PathService::Get(base::DIR_CURRENT, &path);
@@ -37,7 +44,11 @@ base::File OpenCoverageFile() {
   int pool_index = base::RandInt(0, 3);
   std::string filename = base::StrCat(
       {"child_pool-", base::NumberToString(pool_index), ".profraw"});
+#if defined(OS_WIN)
+  path = path.Append(base::UTF8ToUTF16(filename));
+#else
   path = path.Append(filename);
+#endif
   uint32_t flags = base::File::FLAG_OPEN_ALWAYS | base::File::FLAG_READ |
                    base::File::FLAG_WRITE;