IDrm/ICrypto: implement getLogMessages

Bug: 162255728
Test: build
Change-Id: I68edcd04729a5721117e13a48304b842a61dfee5
diff --git a/drm/libmediadrm/include/mediadrm/IDrm.h b/drm/libmediadrm/include/mediadrm/IDrm.h
index ed71eee..b5bc73d 100644
--- a/drm/libmediadrm/include/mediadrm/IDrm.h
+++ b/drm/libmediadrm/include/mediadrm/IDrm.h
@@ -24,6 +24,15 @@
 #define ANDROID_IDRM_H_
 
 namespace android {
+namespace hardware {
+namespace drm {
+namespace V1_4 {
+struct LogMessage;
+}  // namespace V1_4
+}  // namespace drm
+}  // namespace hardware
+
+namespace drm = ::android::hardware::drm;
 
 struct AString;
 
@@ -153,9 +162,12 @@
             DrmPlugin::SecurityLevel securityLevel) const = 0;
 
     virtual status_t setPlaybackId(
+
             Vector<uint8_t> const &sessionId,
             const char *playbackId) = 0;
 
+    virtual status_t getLogMessages(Vector<drm::V1_4::LogMessage> &logs) const = 0;
+
 protected:
     IDrm() {}