[ClangFormat] ObjCSpaceBeforeProtocolList should be true in the google style

[benhamilton]

Summary

The Google style guide is neutral on whether there should be a
space before the protocol list in an Objective-C @interface or
@implementation.

The majority of Objective-C code in both Apple's public
header files and Google's open-source uses a space before
the protocol list, so this changes the google style to
default ObjCSpaceBeforeProtocolList to true.

Test Plan: make -j12 FormatTests && ./tools/clang/unittests/Format/FormatTests

[benhamilton]

Rebase

[benhamilton]

Any way we can get an accept on this one?

lib/Format/Format.cpp

FormatStyle getGoogleStyle(FormatStyle::LanguageKind Language) {
   GoogleStyle.ConstructorInitializerAllOnOneLineOrOnePerLine = true;
   GoogleStyle.DerivePointerAlignment = true;
   GoogleStyle.IncludeCategories = {
       {"^<ext/.*\\.h>", 2}, {"^<.*\\.h>", 1}, {"^<.*", 2}, {".*", 3}};
   GoogleStyle.IncludeIsMainRegex = "([-_](test|unittest))?$";
   GoogleStyle.IndentCaseLabels = true;
   GoogleStyle.KeepEmptyLinesAtTheStartOfBlocks = false;
   GoogleStyle.ObjCSpaceAfterProperty = false;
-  GoogleStyle.ObjCSpaceBeforeProtocolList = false;
+  GoogleStyle.ObjCSpaceBeforeProtocolList = true;
   GoogleStyle.PointerAlignment = FormatStyle::PAS_Left;
   GoogleStyle.RawStringFormats = {{
       FormatStyle::LK_TextProto,
       /*Delimiters=*/
       {
           "pb",
           "PB",
           "proto",

unittests/Format/FormatTestObjC.cpp

TEST_F(FormatTestObjC, FormatObjCInterface) {
 
   verifyFormat("@interface Foo (HackStuff) <MyProtocol> {\n"
                "  int _i;\n"
                "}\n"
                "+ (id)init;\n"
                "@end");
 
   Style = getGoogleStyle(FormatStyle::LK_ObjC);
-  verifyFormat("@interface Foo : NSObject<NSSomeDelegate> {\n"
+  verifyFormat("@interface Foo : NSObject <NSSomeDelegate> {\n"
                " @public\n"
                "  int field1;\n"
                " @protected\n"
                "  int field2;\n"
                " @private\n"
                "  int field3;\n"
                " @package\n"
                "  int field4;\n"
                "}\n"
                "+ (id)init;\n"
                "@end");
-  verifyFormat("@interface Foo : Bar<Baz, Quux>\n"
+  verifyFormat("@interface Foo : Bar <Baz, Quux>\n"
                "+ (id)init;\n"
                "@end");
-  verifyFormat("@interface Foo (HackStuff)<MyProtocol>\n"
+  verifyFormat("@interface Foo (HackStuff) <MyProtocol>\n"
                "+ (id)init;\n"
                "@end");
   Style.BinPackParameters = false;
   Style.ColumnLimit = 80;
-  verifyFormat("@interface aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa ()<\n"
+  verifyFormat("@interface aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa () <\n"
                "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
                "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
                "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa,\n"
                "    aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa> {\n"
                "}");
 }
 
 TEST_F(FormatTestObjC, FormatObjCImplementation) {
verifyFormat("@property(nonatomic, assign, readonly)\n"
                "@property(nonatomic, assign, readonly)\n"
                "    NSString *looooooooooooooooooooooooooooongName;");
 
   verifyFormat("@implementation PR18406\n"
                "}\n"
                "@end");
 
   Style = getGoogleStyle(FormatStyle::LK_ObjC);
-  verifyFormat("@protocol MyProtocol<NSObject>\n"
+  verifyFormat("@protocol MyProtocol <NSObject>\n"
                "- (NSUInteger)numberOfThings;\n"
                "@end");
 }
 
 TEST_F(FormatTestObjC, FormatObjCMethodDeclarations) {
   verifyFormat("- (void)doSomethingWith:(GTMFoo *)theFoo\n"
                "                   rect:(NSRect)theRect\n"
                "               interval:(float)theInterval {\n"