Pass around preferred language to font fallback selection.

chrome/renderer/renderer_sandbox_support_linux.h

Index: chrome/renderer/renderer_sandbox_support_linux.h
diff --git a/chrome/renderer/renderer_sandbox_support_linux.h b/chrome/renderer/renderer_sandbox_support_linux.h
index 60594146733d19deb1e15dcdd30c9394ed827c5f..51a78e7d3d3746e36f49d1f0d1c391aa0801f900 100644
--- a/chrome/renderer/renderer_sandbox_support_linux.h
+++ b/chrome/renderer/renderer_sandbox_support_linux.h
@@ -20,10 +20,13 @@ namespace renderer_sandbox_support {
 // specified by |utf16|
 //   utf16: a native-endian UTF16 string
 //   num_utf16: the number of 16-bit words in |utf16|
+//   preferred_locale: preferred locale identifier for the |utf16|
 //
 // Returns: the font family or an empty string if the request could not be
 // satisfied.
-std::string getFontFamilyForCharacters(const uint16_t* utf16, size_t num_utf16);
+std::string getFontFamilyForCharacters(const uint16_t* utf16,
+                                       size_t num_utf16,
+                                       const char* preferred_locale);
 
 void getRenderStyleForStrike(const char* family, int sizeAndStyle,
                              WebKit::WebFontRenderStyle* out);