Added restricted font fallback to custom font collection loader.

After few experiments/crashes it seems that some users have enormous number of fonts in the registry. On suspect that we have for failing to load collection is that direct write cache is unable to load/handle those many fonts. In this CL we are trying to see if we can put arbitrary limit on number of fonts that could be loaded. We also added a fallback mechanism where in if loading from registry fails, we will try to load only default fonts. Definition of 'default' is taken from file prefs_tab_helper.cc ~ kDefaultFonts.

R=ananta,scottmg,cpu
BUG=399233

Review URL: https://codereview.chromium.org/521483002

Cr-Commit-Position: refs/heads/master@{#292573}

content/renderer/renderer_font_platform_win.cc

@@ -49,6 +49,7 @@ class FontCollectionLoader
   std::wstring GetFontNameFromKey(UINT32 idx);
 
   bool LoadFontListFromRegistry();
+  bool LoadRestrictedFontList();
 
   FontCollectionLoader() {};
   virtual ~FontCollectionLoader() {};
@@ -283,6 +284,47 @@ bool FontCollectionLoader::LoadFontListFromRegistry() {
   return true;
 }
 
+// This list is mainly based on prefs/prefs_tab_helper.cc kFontDefaults.
+const wchar_t* kRestrictedFontSet[] = {
+  L"times.ttf",     // IDS_STANDARD_FONT_FAMILY
+  L"timesbd.ttf",   // IDS_STANDARD_FONT_FAMILY
+  L"timesbi.ttf",   // IDS_STANDARD_FONT_FAMILY
+  L"timesi.ttf",    // IDS_STANDARD_FONT_FAMILY
+  L"cour.ttf",      // IDS_FIXED_FONT_FAMILY
+  L"courbd.ttf",    // IDS_FIXED_FONT_FAMILY
+  L"courbi.ttf",    // IDS_FIXED_FONT_FAMILY
+  L"couri.ttf",     // IDS_FIXED_FONT_FAMILY
+  L"consola.ttf",   // IDS_FIXED_FONT_FAMILY_ALT_WIN
+  L"consolab.ttf",  // IDS_FIXED_FONT_FAMILY_ALT_WIN
+  L"consolai.ttf",  // IDS_FIXED_FONT_FAMILY_ALT_WIN
+  L"consolaz.ttf",  // IDS_FIXED_FONT_FAMILY_ALT_WIN
+  L"arial.ttf",     // IDS_SANS_SERIF_FONT_FAMILY
+  L"arialbd.ttf",   // IDS_SANS_SERIF_FONT_FAMILY
+  L"arialbi.ttf",   // IDS_SANS_SERIF_FONT_FAMILY
+  L"ariali.ttf",    // IDS_SANS_SERIF_FONT_FAMILY
+  L"comic.ttf",     // IDS_CURSIVE_FONT_FAMILY
+  L"comicbd.ttf",   // IDS_CURSIVE_FONT_FAMILY
+  L"comici.ttf",    // IDS_CURSIVE_FONT_FAMILY
+  L"comicz.ttf",    // IDS_CURSIVE_FONT_FAMILY
+  L"impact.ttf",    // IDS_FANTASY_FONT_FAMILY
+  L"segoeui.ttf",   // IDS_PICTOGRAPH_FONT_FAMILY
+  L"segoeuib.ttf",  // IDS_PICTOGRAPH_FONT_FAMILY
+  L"segoeuii.ttf",  // IDS_PICTOGRAPH_FONT_FAMILY
+  L"msgothic.ttc",  // IDS_STANDARD_FONT_FAMILY_JAPANESE
+  L"msmincho.ttc",  // IDS_SERIF_FONT_FAMILY_JAPANESE
+  L"gulim.ttc",     // IDS_FIXED_FONT_FAMILY_KOREAN
+  L"batang.ttc",    // IDS_SERIF_FONT_FAMILY_KOREAN
+  L"simsun.ttc",    // IDS_STANDARD_FONT_FAMILY_SIMPLIFIED_HAN
+  L"mingliu.ttc",   // IDS_SERIF_FONT_FAMILY_TRADITIONAL_HAN
+};
+
+bool FontCollectionLoader::LoadRestrictedFontList() {
+  reg_fonts_.clear();
+  reg_fonts_.assign(kRestrictedFontSet,
+                    kRestrictedFontSet + _countof(kRestrictedFontSet));
+  return true;
+}
+
 }  // namespace
 
 namespace content {
@@ -297,14 +339,29 @@ IDWriteFontCollection* GetCustomFontCollection(IDWriteFactory* factory) {
 
   FontCollectionLoader::Initialize(factory);
 
-  HRESULT hr = factory->CreateCustomFontCollection(
-      g_font_loader.Get(), NULL, 0, g_font_collection.GetAddressOf());
+  // We try here to put arbitrary limit on max number of fonts that could
+  // be loaded, otherwise we fallback to restricted set of fonts.
+  const UINT32 kMaxFontThreshold = 1000;
+  HRESULT hr = E_FAIL;
+  if (g_font_loader->GetFontMapSize() < kMaxFontThreshold) {
+    hr = factory->CreateCustomFontCollection(
+        g_font_loader.Get(), NULL, 0, g_font_collection.GetAddressOf());
+  }
+
+  bool loadingRestricted = false;
+  if (FAILED(hr) || !g_font_collection.Get()) {
+    // We will try here just one more time with restricted font set.
+    g_font_loader->LoadRestrictedFontList();
+    hr = factory->CreateCustomFontCollection(
+        g_font_loader.Get(), NULL, 0, g_font_collection.GetAddressOf());
+  }
 
   base::TimeDelta time_delta = base::TimeTicks::Now() - start_tick;
   int64 delta = time_delta.ToInternalValue();
   base::debug::Alias(&delta);
   UINT32 size = g_font_loader->GetFontMapSize();
   base::debug::Alias(&size);
+  base::debug::Alias(&loadingRestricted);
 
   CHECK(SUCCEEDED(hr));
   CHECK(g_font_collection.Get() != NULL);