Rename SkCodec_libbmp to SkBmpCodec

BUG=skia:

Review URL: https://codereview.chromium.org/1254963006
diff --git a/gyp/codec.gyp b/gyp/codec.gyp
index ce30573..5a368af 100644
--- a/gyp/codec.gyp
+++ b/gyp/codec.gyp
@@ -32,8 +32,8 @@
         '../src/core',
       ],
       'sources': [
+        '../src/codec/SkBmpCodec.cpp',
         '../src/codec/SkCodec.cpp',
-        '../src/codec/SkCodec_libbmp.cpp',
         '../src/codec/SkCodec_libgif.cpp',
         '../src/codec/SkCodec_libico.cpp',
         '../src/codec/SkCodec_libpng.cpp',
diff --git a/src/codec/SkCodec_libbmp.cpp b/src/codec/SkBmpCodec.cpp
similarity index 99%
rename from src/codec/SkCodec_libbmp.cpp
rename to src/codec/SkBmpCodec.cpp
index 13a6f3e..a1f1569 100644
--- a/src/codec/SkCodec_libbmp.cpp
+++ b/src/codec/SkBmpCodec.cpp
@@ -5,7 +5,7 @@
  * found in the LICENSE file.
  */
 
-#include "SkCodec_libbmp.h"
+#include "SkBmpCodec.h"
 #include "SkCodecPriv.h"
 #include "SkColorPriv.h"
 #include "SkStream.h"
diff --git a/src/codec/SkCodec_libbmp.h b/src/codec/SkBmpCodec.h
similarity index 100%
rename from src/codec/SkCodec_libbmp.h
rename to src/codec/SkBmpCodec.h
diff --git a/src/codec/SkCodec.cpp b/src/codec/SkCodec.cpp
index a80b490..1f83680 100644
--- a/src/codec/SkCodec.cpp
+++ b/src/codec/SkCodec.cpp
@@ -5,9 +5,9 @@
  * found in the LICENSE file.
  */
 
+#include "SkBmpCodec.h"
 #include "SkCodec.h"
 #include "SkData.h"
-#include "SkCodec_libbmp.h"
 #include "SkCodec_libgif.h"
 #include "SkCodec_libico.h"
 #include "SkCodec_libpng.h"
diff --git a/src/codec/SkCodec_libico.cpp b/src/codec/SkCodec_libico.cpp
index 7df4879..ea00f65 100644
--- a/src/codec/SkCodec_libico.cpp
+++ b/src/codec/SkCodec_libico.cpp
@@ -5,7 +5,7 @@
  * found in the LICENSE file.
  */
 
-#include "SkCodec_libbmp.h"
+#include "SkBmpCodec.h"
 #include "SkCodec_libico.h"
 #include "SkCodec_libpng.h"
 #include "SkCodecPriv.h"