Refactor String8 to std::string calls

DisplayViewport::uniqueId is now std::string, so change the calls
appropriately. Do some additional cleanups and conversions.
This almost completely removes the dependency on String8.

Test: build only
Bug: 111108021
Change-Id: Ibbb6ca59e9061954d4a5fb930ef03d42cb0230db
diff --git a/tools/validatekeymaps/Android.bp b/tools/validatekeymaps/Android.bp
index 6fb278c..819e75b 100644
--- a/tools/validatekeymaps/Android.bp
+++ b/tools/validatekeymaps/Android.bp
@@ -15,6 +15,7 @@
     ],
 
     static_libs: [
+        "libbase",
         "libinput",
         "libutils",
         "libcutils",
diff --git a/tools/validatekeymaps/Main.cpp b/tools/validatekeymaps/Main.cpp
index bbfcba6..f31f771 100644
--- a/tools/validatekeymaps/Main.cpp
+++ b/tools/validatekeymaps/Main.cpp
@@ -18,7 +18,6 @@
 #include <input/KeyLayoutMap.h>
 #include <input/VirtualKeyMap.h>
 #include <utils/PropertyMap.h>
-#include <utils/String8.h>
 
 #include <stdarg.h>
 #include <stdio.h>
@@ -98,7 +97,7 @@
 
     case FILETYPE_KEYLAYOUT: {
         sp<KeyLayoutMap> map;
-        status_t status = KeyLayoutMap::load(String8(filename), &map);
+        status_t status = KeyLayoutMap::load(filename, &map);
         if (status) {
             error("Error %d parsing key layout file.\n\n", status);
             return false;
@@ -108,7 +107,7 @@
 
     case FILETYPE_KEYCHARACTERMAP: {
         sp<KeyCharacterMap> map;
-        status_t status = KeyCharacterMap::load(String8(filename),
+        status_t status = KeyCharacterMap::load(filename,
                 KeyCharacterMap::FORMAT_ANY, &map);
         if (status) {
             error("Error %d parsing key character map file.\n\n", status);
@@ -130,7 +129,7 @@
 
     case FILETYPE_VIRTUALKEYDEFINITION: {
         VirtualKeyMap* map;
-        status_t status = VirtualKeyMap::load(String8(filename), &map);
+        status_t status = VirtualKeyMap::load(filename, &map);
         if (status) {
             error("Error %d parsing virtual key definition file.\n\n", status);
             return false;