Name core/fxge/android files appropriately and use one file per class

core/fxge/android/cfpf_skiabufferfont.h

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#ifndef CORE_FXGE_ANDROID_CFPF_SKIABUFFERFONT_H_
+#define CORE_FXGE_ANDROID_CFPF_SKIABUFFERFONT_H_
+
+#include "core/fxge/android/cfpf_skiafontdescriptor.h"
+
+#define FPF_SKIAFONTTYPE_Buffer 3
+
+class CFPF_SkiaBufferFont : public CFPF_SkiaFontDescriptor {
+ public:
+  CFPF_SkiaBufferFont() : m_pBuffer(nullptr), m_szBuffer(0) {}
+
+  // CFPF_SkiaFontDescriptor
+  int32_t GetType() const override { return FPF_SKIAFONTTYPE_Buffer; }
+
+  void* m_pBuffer;
+  size_t m_szBuffer;
+};
+
+#endif  // CORE_FXGE_ANDROID_CFPF_SKIABUFFERFONT_H_