add more color formats NV21 and YV12 in video capture (mainly from Android).

media/base/yuv_convert.h

Index: media/base/yuv_convert.h
===================================================================
--- media/base/yuv_convert.h	(revision 132018)
+++ media/base/yuv_convert.h	(working copy)
@@ -113,6 +113,13 @@
                       int width,
                       int height);
 
+void ConvertNV21ToYUV(const uint8* src,

[scherkus (not reviewing), 2012/04/13 03:01:57]

do you know why none of these methods accept a stride?

[wjia(left Chromium), 2012/04/17 23:49:32]

There could be strides for Y and UV (typically aligned to 16 bytes). So far, we
haven't run into stride issue, possibly due to camera resolution selected. Will
re-visit when stride is needed. It requires some change in device capability.

+                      uint8* yplane,
+                      uint8* uplane,
+                      uint8* vplane,
+                      int width,
+                      int height);
+
 // Empty SIMD register state after calling optimized scaler functions.
 // This method is only used in unit test after calling SIMD functions.
 void EmptyRegisterState();