Prevent encoding frames with wrong resolution.

This is a speculative fix for a crash that should be able to happen if a
codec is reconfigured while a frame is leaving the
VideoProcessingModule, causing a mismatch between configured codec and
input frame size.

BUG=
R=magjed@webrtc.org
TBR=mflodman@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/48379004

Cr-Commit-Position: refs/heads/master@{#8615}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8615 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/main/source/codec_database.h

@@ -146,6 +146,8 @@ class VCMCodecDataBase {
   // the encoded frames.
   bool SupportsRenderScheduling() const;
 
+  bool MatchesCurrentResolution(int width, int height) const;
+
  private:
   typedef std::map<uint8_t, VCMDecoderMapItem*> DecoderMap;
   typedef std::map<uint8_t, VCMExtDecoderMapItem*> ExternalDecoderMap;