Revert 251095 "Revert 250828 "Add a UMA stat to track if the Bro..."

Speculative re-land to see if this causes sync tests failures again.
If it does, then we will know if this is the cause.

> Revert 250828 "Add a UMA stat to track if the Browser blacklist ..."
> 
> Speculative revert for failures here:
> 
> http://build.chromium.org/p/chromium.win/builders/Win7%20Sync%20x64/builds/11201
> 
> > Add a UMA stat to track if the Browser blacklist is Set on the Renderer
> > 
> > This shouldn't be happening, but we got some crash reports suggesting it
> > does. Unable to repo locally so this stat will verify it does occur and
> > then can be used to verify our fixes actually fix it.
> > 
> > BUG=329023
> > 
> > Review URL: https://codereview.chromium.org/140763008
> 
> TBR=csharp@chromium.org
> 
> Review URL: https://codereview.chromium.org/163633005

TBR=asvitkine@chromium.org

Review URL: https://codereview.chromium.org/164833002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251134 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 21 insertions, 1 deletions

diff --git a/chrome_elf/blacklist/blacklist.cc b/chrome_elf/blacklist/blacklist.cc
index ea140c4..32d3cb2 100644
--- a/chrome_elf/blacklist/blacklist.cc
+++ b/chrome_elf/blacklist/blacklist.cc
@@ -60,6 +60,10 @@ enum WOW64Status {
   WOW64_UNKNOWN,
 };
 
+// Record if the blacklist was successfully initialized so processes can easily
+// determine if the blacklist is enabled for them.
+bool g_blacklist_initialized = false;
+
 WOW64Status GetWOW64StatusForCurrentProcess() {
   typedef BOOL (WINAPI* IsWow64ProcessFunc)(HANDLE, PBOOL);
   IsWow64ProcessFunc is_wow64_process = reinterpret_cast<IsWow64ProcessFunc>(
@@ -272,6 +276,10 @@ int BlacklistSize() {
   return size;
 }
 
+bool IsBlacklistInitialized() {
+  return g_blacklist_initialized;
+}
+
 bool AddDllToBlacklist(const wchar_t* dll_name) {
   int blacklist_size = BlacklistSize();
   // We need to leave one space at the end for the null pointer.
@@ -373,6 +381,9 @@ bool Initialize(bool force) {
   }
 #endif
 
+  // Record that we have initialized the blacklist.
+  g_blacklist_initialized = true;
+
   BYTE* thunk_storage = reinterpret_cast<BYTE*>(&g_thunk_storage);
 
   // Mark the thunk storage as readable and writeable, since we
diff --git a/chrome_elf/blacklist/blacklist.h b/chrome_elf/blacklist/blacklist.h
index 5237a5c..2e21f20 100644
--- a/chrome_elf/blacklist/blacklist.h
+++ b/chrome_elf/blacklist/blacklist.h
@@ -61,6 +61,9 @@ bool ResetBeacon();
 // Return the size of the current blacklist.
 int BlacklistSize();
 
+// Returns if true if the blacklist has been initialized.
+extern "C" bool IsBlacklistInitialized();
+
 // Adds the given dll name to the blacklist. Returns true if the dll name is in
 // the blacklist when this returns, false on error. Note that this will copy
 // |dll_name| and will leak it on exit if the string is not subsequently removed
diff --git a/chrome_elf/blacklist/test/blacklist_test.cc b/chrome_elf/blacklist/test/blacklist_test.cc
index 3a881ad..39db737 100644
--- a/chrome_elf/blacklist/test/blacklist_test.cc
+++ b/chrome_elf/blacklist/test/blacklist_test.cc
@@ -32,6 +32,7 @@ extern "C" {
 // functions on the test blacklist dll, not the ones linked into the test
 // executable itself.
 __declspec(dllimport) bool TestDll_AddDllToBlacklist(const wchar_t* dll_name);
+__declspec(dllimport) bool TestDLL_IsBlacklistInitialized();
 __declspec(dllimport) bool TestDll_RemoveDllFromBlacklist(
     const wchar_t* dll_name);
 }
@@ -120,6 +121,9 @@ TEST_F(BlacklistTest, LoadBlacklistedLibrary) {
   base::FilePath current_dir;
   ASSERT_TRUE(PathService::Get(base::DIR_EXE, &current_dir));
 
+  // Ensure that the blacklist is loaded.
+  ASSERT_TRUE(TestDLL_IsBlacklistInitialized());
+
   // Test that an un-blacklisted DLL can load correctly.
   base::ScopedNativeLibrary dll1(current_dir.Append(kTestDllName1));
   EXPECT_TRUE(dll1.is_valid());
diff --git a/chrome_elf/blacklist/test/blacklist_test_main_dll.def b/chrome_elf/blacklist/test/blacklist_test_main_dll.def
index 63522a0..82e0f0e 100644
--- a/chrome_elf/blacklist/test/blacklist_test_main_dll.def
+++ b/chrome_elf/blacklist/test/blacklist_test_main_dll.def
@@ -6,5 +6,6 @@ LIBRARY  "blacklist_test_main_dll.dll"
 
 EXPORTS
   TestDll_AddDllToBlacklist=AddDllToBlacklist
+  TestDLL_IsBlacklistInitialized=IsBlacklistInitialized
   TestDll_RemoveDllFromBlacklist=RemoveDllFromBlacklist
-  InitBlacklistTestDll
+  InitBlacklistTestDll
\ No newline at end of file
diff --git a/chrome_elf/chrome_elf.def b/chrome_elf/chrome_elf.def
index 3e88cfa..ee9808f 100644
--- a/chrome_elf/chrome_elf.def
+++ b/chrome_elf/chrome_elf.def
@@ -6,4 +6,5 @@ LIBRARY  "chrome_elf.dll"
 
 EXPORTS
   CreateFileW=CreateFileWRedirect
+  IsBlacklistInitialized
   SignalChromeElf