Add supporting to V4L2_PIX_FMT_JPEG since it works same as MJPEG.

ISSUE=529
TEST=unittest
Review URL: https://webrtc-codereview.appspot.com/1120006

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3580 4adac7df-926f-26a2-2b94-8c16560cd09d
diff --git a/webrtc/modules/video_capture/linux/video_capture_linux.cc b/webrtc/modules/video_capture/linux/video_capture_linux.cc
index efd262a..de4958e 100644
--- a/webrtc/modules/video_capture/linux/video_capture_linux.cc
+++ b/webrtc/modules/video_capture/linux/video_capture_linux.cc
@@ -153,16 +153,18 @@
     // Supported video formats in preferred order.
     // If the requested resolution is larger than VGA, we prefer MJPEG. Go for
     // I420 otherwise.
-    const int nFormats = 3;
+    const int nFormats = 4;
     unsigned int fmts[nFormats];
     if (capability.width > 640 || capability.height > 480) {
         fmts[0] = V4L2_PIX_FMT_MJPEG;
         fmts[1] = V4L2_PIX_FMT_YUV420;
         fmts[2] = V4L2_PIX_FMT_YUYV;
+        fmts[3] = V4L2_PIX_FMT_JPEG;
     } else {
         fmts[0] = V4L2_PIX_FMT_YUV420;
         fmts[1] = V4L2_PIX_FMT_YUYV;
         fmts[2] = V4L2_PIX_FMT_MJPEG;
+        fmts[3] = V4L2_PIX_FMT_JPEG;
     }
 
     // Enumerate image formats.
@@ -212,7 +214,8 @@
         _captureVideoType = kVideoYUY2;
     else if (video_fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_YUV420)
         _captureVideoType = kVideoI420;
-    else if (video_fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG)
+    else if (video_fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_MJPEG ||
+             video_fmt.fmt.pix.pixelformat == V4L2_PIX_FMT_JPEG)
         _captureVideoType = kVideoMJPEG;
 
     //set format and frame size now