Move functionality out from AudioFrame and into AudioFrameOperations.

webrtc/modules/utility/source/audio_frame_operations_unittest.cc

Index: webrtc/modules/utility/source/audio_frame_operations_unittest.cc
diff --git a/webrtc/modules/utility/source/audio_frame_operations_unittest.cc b/webrtc/modules/utility/source/audio_frame_operations_unittest.cc
index 5842b90c0a28a490e9ad7f8c2dfedade9719de56..e9943a57a4b468ddb6f064dc83dd84b159370aba 100644
--- a/webrtc/modules/utility/source/audio_frame_operations_unittest.cc
+++ b/webrtc/modules/utility/source/audio_frame_operations_unittest.cc
@@ -365,5 +365,15 @@ TEST_F(AudioFrameOperationsTest, ScaleWithSatSucceeds) {
   VerifyFramesAreEqual(scaled_frame, frame_);
 }
 
+TEST(ClampToInt16, TestCases) {
+  EXPECT_EQ(0x0000, ClampToInt16(0x00000000));
+  EXPECT_EQ(0x0001, ClampToInt16(0x00000001));
+  EXPECT_EQ(0x7FFF, ClampToInt16(0x00007FFF));
+  EXPECT_EQ(0x7FFF, ClampToInt16(0x7FFFFFFF));
+  EXPECT_EQ(-0x0001, ClampToInt16(-0x00000001));
+  EXPECT_EQ(-0x8000, ClampToInt16(-0x8000));
+  EXPECT_EQ(-0x8000, ClampToInt16(-0x7FFFFFFF));
+}
+
 }  // namespace
 }  // namespace webrtc