Only one function for reporting usage support.

[ Merge of http://go/wvgerrit/121567 ]

Replaced the two usage support functions GetUsageSupportType() and
UsageInformationSupport() into a single function HasUsageInfoSupport().

Since moving to only supporting a single usage info system (usage table
header + usage entries), the different usage support functions have
lost their purpose.

One version of the method works on an open session and will use a
cached value of the property if previously set.  The other can be
called without opening the session (as used for query calls).

This is part of larger fix for the usage table initialization process.

Bug: 169195093
Test: CE CDM unit tests
Change-Id: I637c24dd143e995dbb0f8848850e3c71ff1018eb

libwvdrmengine/cdm/core/include/cdm_session.h

@@ -160,8 +160,8 @@ class CdmSession {
             license_parser_->provider_session_token().size() > 0);
   }
 
-  virtual CdmUsageSupportType get_usage_support_type() {
-    return usage_support_type_;
+  virtual bool supports_usage_info() const {
+    return usage_table_header_ != nullptr;
   }
 
   // This method will remove keys by resetting crypto resources and
@@ -297,8 +297,9 @@ class CdmSession {
   // Usage related flags and data
   bool is_initial_usage_update_;
   bool is_usage_update_needed_;
-  CdmUsageSupportType usage_support_type_;
-  UsageTableHeader* usage_table_header_;
+  // Only assign |usage_table_header_| if capable of supporting usage
+  // information.
+  UsageTableHeader* usage_table_header_ = nullptr;
   uint32_t usage_entry_number_;
   CdmUsageEntry usage_entry_;
   std::string usage_provider_session_token_;