Add continuous focus mode constant.

bug:2612447
Change-Id: I9bc3f5a47ad50722a265d50b1d28fb82a2253dc9
diff --git a/camera/CameraParameters.cpp b/camera/CameraParameters.cpp
index b50d4d2..d8f9c71 100644
--- a/camera/CameraParameters.cpp
+++ b/camera/CameraParameters.cpp
@@ -137,6 +137,7 @@
 const char CameraParameters::FOCUS_MODE_MACRO[] = "macro";
 const char CameraParameters::FOCUS_MODE_FIXED[] = "fixed";
 const char CameraParameters::FOCUS_MODE_EDOF[] = "edof";
+const char CameraParameters::FOCUS_MODE_CONTINUOUS[] = "continuous";
 
 CameraParameters::CameraParameters()
                 : mMap()
diff --git a/include/camera/CameraParameters.h b/include/camera/CameraParameters.h
index 3b0e9e5..0d27f1a 100644
--- a/include/camera/CameraParameters.h
+++ b/include/camera/CameraParameters.h
@@ -316,6 +316,12 @@
     // continuously. Applications should not call
     // CameraHardwareInterface.autoFocus in this mode.
     static const char FOCUS_MODE_EDOF[];
+    // Continuous focus mode. The camera continuously tries to focus. This is
+    // ideal for shooting video or shooting photo of moving object. Continuous
+    // focus starts when CameraHardwareInterface.autoFocus is called. Focus
+    // callback will be only called once as soon as the picture is in focus.
+    static const char FOCUS_MODE_CONTINUOUS[];
+
 
 private:
     DefaultKeyedVector<String8,String8>    mMap;