Make SizeIsMatcher::Impl conform to the contract of MatcherDescriberInterface.

MatcherDescriberInterface specifies that DescribeTo "should print a verb phrase", but "size ..." is not a verb phrase. Currently, ElementsAre(SizeIs(9)) is described as "has 1 element that size is equal to 9". With this change, it will be described as "has 1 element that has a size that is equal to 9".

PiperOrigin-RevId: 492022324
Change-Id: I4083335f2419462464957521c1e033643b53b763

googlemock/include/gmock/gmock-matchers.h

@@ -2309,11 +2309,11 @@ class SizeIsMatcher {
         : size_matcher_(MatcherCast<SizeType>(size_matcher)) {}
 
     void DescribeTo(::std::ostream* os) const override {
-      *os << "size ";
+      *os << "has a size that ";
       size_matcher_.DescribeTo(os);
     }
     void DescribeNegationTo(::std::ostream* os) const override {
-      *os << "size ";
+      *os << "has a size that ";
       size_matcher_.DescribeNegationTo(os);
     }
 

googlemock/test/gmock-matchers-containers_test.cc

@@ -1182,8 +1182,8 @@ TEST(SizeIsTest, WorksWithMinimalistCustomType) {
 
 TEST(SizeIsTest, CanDescribeSelf) {
   Matcher<vector<int>> m = SizeIs(2);
-  EXPECT_EQ("size is equal to 2", Describe(m));
-  EXPECT_EQ("size isn't equal to 2", DescribeNegation(m));
+  EXPECT_EQ("has a size that is equal to 2", Describe(m));
+  EXPECT_EQ("has a size that isn't equal to 2", DescribeNegation(m));
 }
 
 TEST(SizeIsTest, ExplainsResult) {