Capture font-related data in minidump when last resort font failed

third_party/WebKit/Source/platform/fonts/FontCache.cpp

Index: third_party/WebKit/Source/platform/fonts/FontCache.cpp
diff --git a/third_party/WebKit/Source/platform/fonts/FontCache.cpp b/third_party/WebKit/Source/platform/fonts/FontCache.cpp
index 5eddfddc66b58cf86267e23da94bef5adbed27b2..30d64c3e18ec1490398bf1ac4017942418a0ca72 100644
--- a/third_party/WebKit/Source/platform/fonts/FontCache.cpp
+++ b/third_party/WebKit/Source/platform/fonts/FontCache.cpp
@@ -29,6 +29,7 @@
 
 #include "platform/fonts/FontCache.h"
 
+#include <memory>
 #include "base/trace_event/process_memory_dump.h"
 #include "platform/FontFamilyNames.h"
 #include "platform/Histogram.h"
@@ -54,9 +55,9 @@
 #include "wtf/PtrUtil.h"
 #include "wtf/StdLibExtras.h"
 #include "wtf/Vector.h"
+#include "wtf/debug/Alias.h"
 #include "wtf/text/AtomicStringHash.h"
 #include "wtf/text/StringHash.h"
-#include <memory>
 
 using namespace WTF;
 
@@ -455,6 +456,24 @@ void FontCache::invalidate() {
   purge(ForcePurge);
 }
 
+void FontCache::crashWithFontInfo(const FontDescription* fontDescription) {
+  FontCache* fontCache = FontCache::fontCache();
+  SkFontMgr* fontMgr = nullptr;
+  int numFamilies = std::numeric_limits<int>::min();
+  if (fontCache) {
+    fontMgr = fontCache->m_fontManager.get();
+    if (fontMgr)
+      numFamilies = fontMgr->countFamilies();
+  }
+
+  debug::alias(&fontDescription);
+  debug::alias(&fontCache);
+  debug::alias(&fontMgr);
+  debug::alias(&numFamilies);
+
+  CHECK(false);
+}
+
 void FontCache::dumpFontPlatformDataCache(
     base::trace_event::ProcessMemoryDump* memoryDump) {
   ASSERT(isMainThread());