Create direct write font proxy classes and unit tests.

content/common/font_warmup_win.cc

Index: content/common/font_warmup_win.cc
diff --git a/content/common/font_warmup_win.cc b/content/common/font_warmup_win.cc
index 6a059d03c42bd6b74630921e4b2b817fe7ff0934..ddc1889d11dd93d52ef67d13e19dd8ee1febda7b 100644
--- a/content/common/font_warmup_win.cc
+++ b/content/common/font_warmup_win.cc
@@ -96,56 +96,6 @@ NTSTATUS WINAPI NtALpcConnectPortPatch(HANDLE* port_handle,
   return STATUS_ACCESS_DENIED;
 }
 
-// Directwrite connects to the font cache service to retrieve information about
-// fonts installed on the system etc. This works well outside the sandbox and
-// within the sandbox as long as the lpc connection maintained by the current
-// process with the font cache service remains valid. It appears that there
-// are cases when this connection is dropped after which directwrite is unable
-// to connect to the font cache service which causes problems with characters
-// disappearing.
-// Directwrite has fallback code to enumerate fonts if it is unable to connect
-// to the font cache service. We need to intercept the following APIs to
-// ensure that it does not connect to the font cache service.
-// NtALpcConnectPort
-// OpenSCManagerW
-// OpenServiceW
-// StartServiceW
-// CloseServiceHandle.
-// These are all IAT patched.
-void PatchServiceManagerCalls() {
-  static bool is_patched = false;
-  if (is_patched)
-    return;
-  const char* service_provider_dll =
-      (base::win::GetVersion() >= base::win::VERSION_WIN8
-           ? "api-ms-win-service-management-l1-1-0.dll"
-           : "advapi32.dll");
-
-  is_patched = true;
-
-  DWORD patched =
-      g_iat_patch_open_sc_manager.Patch(L"dwrite.dll", service_provider_dll,
-                                        "OpenSCManagerW", OpenSCManagerWPatch);
-  DCHECK(patched == 0);
-
-  patched = g_iat_patch_close_service_handle.Patch(
-      L"dwrite.dll", service_provider_dll, "CloseServiceHandle",
-      CloseServiceHandlePatch);
-  DCHECK(patched == 0);
-
-  patched = g_iat_patch_open_service.Patch(L"dwrite.dll", service_provider_dll,
-                                           "OpenServiceW", OpenServiceWPatch);
-  DCHECK(patched == 0);
-
-  patched = g_iat_patch_start_service.Patch(
-      L"dwrite.dll", service_provider_dll, "StartServiceW", StartServiceWPatch);
-  DCHECK(patched == 0);
-
-  patched = g_iat_patch_nt_connect_port.Patch(
-      L"dwrite.dll", "ntdll.dll", "NtAlpcConnectPort", NtALpcConnectPortPatch);
-  DCHECK(patched == 0);
-}
-
 // Windows-only DirectWrite support. These warm up the DirectWrite paths
 // before sandbox lock down to allow Skia access to the Font Manager service.
 void CreateDirectWriteFactory(IDWriteFactory** factory) {
@@ -461,6 +411,56 @@ GdiFontPatchDataImpl::GdiFontPatchDataImpl(const base::FilePath& path) {
 
 }  // namespace
 
+// Directwrite connects to the font cache service to retrieve information about
+// fonts installed on the system etc. This works well outside the sandbox and
+// within the sandbox as long as the lpc connection maintained by the current
+// process with the font cache service remains valid. It appears that there
+// are cases when this connection is dropped after which directwrite is unable
+// to connect to the font cache service which causes problems with characters
+// disappearing.
+// Directwrite has fallback code to enumerate fonts if it is unable to connect
+// to the font cache service. We need to intercept the following APIs to
+// ensure that it does not connect to the font cache service.
+// NtALpcConnectPort
+// OpenSCManagerW
+// OpenServiceW
+// StartServiceW
+// CloseServiceHandle.
+// These are all IAT patched.
+void PatchServiceManagerCalls() {
+  static bool is_patched = false;
+  if (is_patched)
+    return;
+  const char* service_provider_dll =
+      (base::win::GetVersion() >= base::win::VERSION_WIN8
+           ? "api-ms-win-service-management-l1-1-0.dll"
+           : "advapi32.dll");
+
+  is_patched = true;
+
+  DWORD patched =
+      g_iat_patch_open_sc_manager.Patch(L"dwrite.dll", service_provider_dll,
+                                        "OpenSCManagerW", OpenSCManagerWPatch);
+  DCHECK(patched == 0);
+
+  patched = g_iat_patch_close_service_handle.Patch(
+      L"dwrite.dll", service_provider_dll, "CloseServiceHandle",
+      CloseServiceHandlePatch);
+  DCHECK(patched == 0);
+
+  patched = g_iat_patch_open_service.Patch(L"dwrite.dll", service_provider_dll,
+                                           "OpenServiceW", OpenServiceWPatch);
+  DCHECK(patched == 0);
+
+  patched = g_iat_patch_start_service.Patch(
+      L"dwrite.dll", service_provider_dll, "StartServiceW", StartServiceWPatch);
+  DCHECK(patched == 0);
+
+  patched = g_iat_patch_nt_connect_port.Patch(
+      L"dwrite.dll", "ntdll.dll", "NtAlpcConnectPort", NtALpcConnectPortPatch);
+  DCHECK(patched == 0);
+}
+
 void DoPreSandboxWarmupForTypeface(SkTypeface* typeface) {
   SkPaint paint_warmup;
   paint_warmup.setTypeface(typeface);