Merge CDM LRU change to Android.

[ Merge of http://go/wvgerrit/81903 ]
[ Merge of http://go/wvgerrit/87473 ]
[ Merge of http://go/wvgerrit/82568 ]
[ Merge of http://go/wvgerrit/87266 ]
[ Merge of http://go/wvgerrit/87474 ]
[ Merge of http://go/wvgerrit/87475 ]

Bug: 135046978
Test: GTS and Android unit tests
Change-Id: Iff2ff62cea21eeb36d7b56c8bb852fce8447ff89

libwvdrmengine/cdm/core/test/mock_clock.h

@@ -15,6 +15,18 @@ class MockClock : public Clock {
   MOCK_METHOD0(GetCurrentTime, int64_t());
 };
 
+// Frozen clock will always return the same value for the current time.
+// Intended to be used for testing where using the actual time would
+// cause flaky tests.
+class FrozenClock : public Clock {
+  int64_t always_time_;
+
+ public:
+  FrozenClock(int64_t always_time = 0) : always_time_(always_time) {}
+  int64_t GetCurrentTime() override { return always_time_; }
+  void SetTime(int64_t new_time) { always_time_ = new_time; }
+};
+
 }  // wvcdm
 
 #endif  // CDM_TEST_MOCK_CLOCK_H_