AAPT2: Rename to match new style

Use Google3 naming style to match new
projects' and open source google projects' style.

Preferred to do this in a massive CL so as to avoid
style inconsistencies that plague legacy code bases.
This is a relatively NEW code base, may as well keep
it up to date.

Test: name/style refactor - existing tests pass
Change-Id: Ie80ecb78d46ec53efdfca2336bb57d96cbb7fb87
diff --git a/tools/aapt2/Main.cpp b/tools/aapt2/Main.cpp
index 8aedd44..8dd176d 100644
--- a/tools/aapt2/Main.cpp
+++ b/tools/aapt2/Main.cpp
@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-#include "util/StringPiece.h"
-
 #include <iostream>
 #include <vector>
 
+#include "util/StringPiece.h"
+
 namespace aapt {
 
 // DO NOT UPDATE, this is more of a marketing version.
@@ -27,16 +27,16 @@
 // Update minor version whenever a feature or flag is added.
 static const char* sMinorVersion = "2";
 
-int printVersion() {
+int PrintVersion() {
   std::cerr << "Android Asset Packaging Tool (aapt) " << sMajorVersion << "."
             << sMinorVersion << std::endl;
   return 0;
 }
 
-extern int compile(const std::vector<StringPiece>& args);
-extern int link(const std::vector<StringPiece>& args);
-extern int dump(const std::vector<StringPiece>& args);
-extern int diff(const std::vector<StringPiece>& args);
+extern int Compile(const std::vector<StringPiece>& args);
+extern int Link(const std::vector<StringPiece>& args);
+extern int Dump(const std::vector<StringPiece>& args);
+extern int Diff(const std::vector<StringPiece>& args);
 
 }  // namespace aapt
 
@@ -52,15 +52,15 @@
 
     aapt::StringPiece command(argv[0]);
     if (command == "compile" || command == "c") {
-      return aapt::compile(args);
+      return aapt::Compile(args);
     } else if (command == "link" || command == "l") {
-      return aapt::link(args);
+      return aapt::Link(args);
     } else if (command == "dump" || command == "d") {
-      return aapt::dump(args);
+      return aapt::Dump(args);
     } else if (command == "diff") {
-      return aapt::diff(args);
+      return aapt::Diff(args);
     } else if (command == "version") {
-      return aapt::printVersion();
+      return aapt::PrintVersion();
     }
     std::cerr << "unknown command '" << command << "'\n";
   } else {