Add a font API to Pepper and implement on Linux based on agl's ...

chrome/renderer/renderer_sandbox_support_linux.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.  Use of this
 // source code is governed by a BSD-style license that can be found in the
 // LICENSE file.
 
 #ifndef CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_
 #define CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_
 
 #include <stdint.h>
 
 #include <string>
 
+#include "third_party/npapi/bindings/npapi_extensions.h"
+
 namespace WebKit {
 struct WebFontRenderStyle;
 }
 
 namespace renderer_sandbox_support {
 
 // Return a font family which provides glyphs for the Unicode code points
 // specified by |utf16|
 //   utf16: a native-endian UTF16 string
 //   num_utf16: the number of 16-bit words in |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);
 
 void getRenderStyleForStrike(const char* family, int sizeAndStyle,
                              WebKit::WebFontRenderStyle* out);
 
 // Returns a file descriptor for a shared memory segment.
 int MakeSharedMemorySegmentViaIPC(size_t length);
 
+// Return a read-only file descriptor to the font which best matches the given
+// properties or -1 on failure.
+//   charset: specifies the language(s) that the font must cover. See
+// render_sandbox_host_linux.cc for more information.
+int MatchFontWithFallback(const std::string& face, bool bold,
+                          bool italic, NPCharset charset);
+
+// GetFontTable loads a specified font table from an open SFNT file.
+//   fd: a file descriptor to the SFNT file. The position doesn't matter.
+//   table: the table in *big-endian* format, or 0 for the whole font file.
+//   output: a buffer of size output_length that gets the data.  can be 0, in
+//     which case output_length will be set to the required size in bytes.
+//   output_length: size of output, if it's not 0.
+//
+//   returns: true on success.
+bool GetFontTable(int fd, uint32_t table, uint8_t* output,
+                  size_t* output_length);
+
 };  // namespace render_sandbox_support
 
 #endif  // CHROME_RENDERER_RENDERER_SANDBOX_SUPPORT_LINUX_H_