DO NOT MERGE: ViewRoot/BBQ: Cleanup flushShadowQueue

It's already a noop, we just never cleaned up the
frameworks/base side.

Bug: 200285149
Test: Existing tests pass
Change-Id: I7d79404f93a9386b16fb9770bbd7290dfb236cc0

core/java/android/view/ViewRootImpl.java

@@ -4164,11 +4164,6 @@ public final class ViewRootImpl implements ViewParent,
                         }
                     });
                 });
-            } else if (reportNextDraw) {
-                // If we need to report next draw, wait for adapter to flush its shadow queue
-                // by processing previously queued buffers so that we can submit the
-                // transaction a timely manner.
-                mBlastBufferQueue.flushShadowQueue();
             }
         };
         registerRtFrameCallback(frameDrawingCallback);

core/jni/android_graphics_BLASTBufferQueue.cpp

@@ -112,11 +112,6 @@ static void nativeUpdate(JNIEnv* env, jclass clazz, jlong ptr, jlong surfaceCont
                   transaction);
 }
 
-static void nativeFlushShadowQueue(JNIEnv* env, jclass clazz, jlong ptr) {
-    sp<BLASTBufferQueue> queue = reinterpret_cast<BLASTBufferQueue*>(ptr);
-    queue->flushShadowQueue();
-}
-
 static void nativeMergeWithNextTransaction(JNIEnv*, jclass clazz, jlong ptr, jlong transactionPtr,
                                            jlong framenumber) {
     sp<BLASTBufferQueue> queue = reinterpret_cast<BLASTBufferQueue*>(ptr);
@@ -147,7 +142,6 @@ static const JNINativeMethod gMethods[] = {
         {"nativeDestroy", "(J)V", (void*)nativeDestroy},
         {"nativeSetNextTransaction", "(JJ)V", (void*)nativeSetNextTransaction},
         {"nativeUpdate", "(JJJJIJ)V", (void*)nativeUpdate},
-        {"nativeFlushShadowQueue", "(J)V", (void*)nativeFlushShadowQueue},
         {"nativeMergeWithNextTransaction", "(JJJ)V", (void*)nativeMergeWithNextTransaction},
         {"nativeSetTransactionCompleteCallback",
                 "(JJLandroid/graphics/BLASTBufferQueue$TransactionCompleteCallback;)V",

graphics/java/android/graphics/BLASTBufferQueue.java

@@ -34,7 +34,6 @@ public final class BLASTBufferQueue {
     private static native void nativeSetNextTransaction(long ptr, long transactionPtr);
     private static native void nativeUpdate(long ptr, long surfaceControl, long width, long height,
             int format, long transactionPtr);
-    private static native void nativeFlushShadowQueue(long ptr);
     private static native void nativeMergeWithNextTransaction(long ptr, long transactionPtr,
                                                               long frameNumber);
     private static native void nativeSetTransactionCompleteCallback(long ptr, long frameNumber,
@@ -124,10 +123,6 @@ public final class BLASTBufferQueue {
         }
     }
 
-    public void flushShadowQueue() {
-        nativeFlushShadowQueue(mNativeObject);
-    }
-
     /**
      * Merge the transaction passed in to the next transaction in BlastBufferQueue. The next
      * transaction will be applied or merged when the next frame with specified frame number