IWYU: Include all headers for symbols used in files.

Semi-automatically taking the the misc-include-cleaner warnings
by clang-tidy and fixing files to be self-contained.

Change-Id: Iaaa2b2ec9d6dcce547fa5cb6b4f056dfc8c781ff

src/mux/anim_encode.c

@@ -15,6 +15,7 @@
 #include <math.h>    // for pow()
 #include <stdio.h>
 #include <stdlib.h>  // for abs()
+#include <string.h>
 
 #include "src/mux/animi.h"
 #include "src/utils/utils.h"
@@ -22,6 +23,7 @@
 #include "src/webp/encode.h"
 #include "src/webp/format_constants.h"
 #include "src/webp/mux.h"
+#include "src/webp/mux_types.h"
 #include "src/webp/types.h"
 
 #if defined(_MSC_VER) && _MSC_VER < 1900

src/mux/muxedit.c

@@ -13,8 +13,16 @@
 //          Vikas (vikasa@google.com)
 
 #include <assert.h>
+#include <stddef.h>
+#include <string.h>
+
+#include "src/dec/vp8_dec.h"
 #include "src/mux/muxi.h"
 #include "src/utils/utils.h"
+#include "src/webp/format_constants.h"
+#include "src/webp/mux.h"
+#include "src/webp/mux_types.h"
+#include "src/webp/types.h"
 
 //------------------------------------------------------------------------------
 // Life of a mux object.

src/mux/muxi.h

@@ -16,9 +16,13 @@
 
 #include <assert.h>
 #include <stdlib.h>
+
 #include "src/dec/vp8i_dec.h"
 #include "src/dec/vp8li_dec.h"
+#include "src/webp/format_constants.h"
 #include "src/webp/mux.h"
+#include "src/webp/mux_types.h"
+#include "src/webp/types.h"
 
 #ifdef __cplusplus
 extern "C" {

src/mux/muxinternal.c

@@ -13,8 +13,15 @@
 //          Vikas (vikasa@google.com)
 
 #include <assert.h>
+#include <stddef.h>
+#include <string.h>
+
 #include "src/mux/muxi.h"
+#include "src/webp/types.h"
 #include "src/utils/utils.h"
+#include "src/webp/format_constants.h"
+#include "src/webp/mux.h"
+#include "src/webp/mux_types.h"
 
 #define UNDEFINED_CHUNK_SIZE ((uint32_t)(-1))
 
@@ -546,4 +553,3 @@ WebPMuxError MuxValidate(const WebPMux* const mux) {
 #undef NO_FLAG
 
 //------------------------------------------------------------------------------
-

src/mux/muxread.c

@@ -13,8 +13,15 @@
 //          Vikas (vikasa@google.com)
 
 #include <assert.h>
+#include <stddef.h>
+
+#include "src/dec/vp8_dec.h"
 #include "src/mux/muxi.h"
 #include "src/utils/utils.h"
+#include "src/webp/format_constants.h"
+#include "src/webp/mux.h"
+#include "src/webp/mux_types.h"
+#include "src/webp/types.h"
 
 //------------------------------------------------------------------------------
 // Helper method(s).