Add feature flag to change the CDM version to 18.0.2

[ Merge of http://go/wvgerrit/191139 ]

Adding an initial flag that include identifiable differences when
the feature is enabled or disabled.

This is the same commit as ag/25837302. It was reverted due to
memory size issues. A follow on CL will address that issue to
ease review.

Bug: 311951236
Test: WVTS tests
Change-Id: I995fb8f4158b3529c2d19a2ee5fd8beec0019f7c

libwvdrmengine/cdm/src/properties_android.cpp

@@ -12,11 +12,15 @@
 #include <android-base/properties.h>
 #include <android/sysprop/WidevineProperties.sysprop.h>
 
+#include <com_android_mediadrm_widevine_flags.h>
+
 #include "log.h"
 #include "wv_android_constants.h"
 #include "widevine_apex_info.h"
 
 using namespace android::sysprop;
+
+namespace mediadrm_flags = com::android::mediadrm::widevine::flags;
 namespace {
 
 const char kBasePathPrefix[] = "/data/vendor/mediadrm/IDM";
@@ -146,7 +150,11 @@ bool Properties::GetWVCdmVersion(std::string* version) {
 }
 #endif
 
-  *version = kWVAndroidCdmVersion + apex_version;
+  if (mediadrm_flags::update_cdm_version_to_18_0_2()) {
+    *version = kWVAndroidCdmVersion_18_0_2 + apex_version;
+  } else {
+    *version = kWVAndroidCdmVersion_18_0_1 + apex_version;
+  }
   return true;
 }