Reduce Canvas FontCache size on low end devices

third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp

Index: third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
diff --git a/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp b/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
index b5c526018e836751b1ff0dbe79afe6ce776bf5d5..6bdcd59fcd2d2fdd6f9be91b7244d8e41bad5d22 100644
--- a/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
+++ b/third_party/WebKit/Source/core/html/canvas/CanvasFontCache.cpp
@@ -15,7 +15,9 @@
 namespace {
 
 const unsigned CanvasFontCacheMaxFonts = 50;
+const unsigned CanvasFontCacheMaxFontsLowEnd = 5;
 const unsigned CanvasFontCacheHardMaxFonts = 250;
+const unsigned CanvasFontCacheHardMaxFontsLowEnd = 20;
 const unsigned CanvasFontCacheHiddenMaxFonts = 1;
 const int defaultFontSize = 10;
 const char defaultFontFamily[] = "sans-serif";
@@ -45,12 +47,15 @@ CanvasFontCache::~CanvasFontCache() {
 }
 
 unsigned CanvasFontCache::MaxFonts() {
-  return CanvasFontCacheMaxFonts;
+  return MemoryCoordinator::IsLowEndDevice() ? CanvasFontCacheMaxFontsLowEnd
+                                             : CanvasFontCacheMaxFonts;
 }
 
 unsigned CanvasFontCache::HardMaxFonts() {
   return document_->hidden() ? CanvasFontCacheHiddenMaxFonts
-                             : CanvasFontCacheHardMaxFonts;
+                             : (MemoryCoordinator::IsLowEndDevice()
+                                    ? CanvasFontCacheHardMaxFontsLowEnd
+                                    : CanvasFontCacheHardMaxFonts);
 }
 
 bool CanvasFontCache::GetFontUsingDefaultStyle(const String& font_string,