Move inval dedup to Window for wider usages.

tools/viewer/sk_app/android/surface_glue_android.h

Index: tools/viewer/sk_app/android/surface_glue_android.h
diff --git a/tools/viewer/sk_app/android/surface_glue_android.h b/tools/viewer/sk_app/android/surface_glue_android.h
index 7ffba3080a9644b9125fb5bae3e08dd47f2dd1cc..a4698336f04b4ea1489eb7a1caaf70b84b5b4f92 100644
--- a/tools/viewer/sk_app/android/surface_glue_android.h
+++ b/tools/viewer/sk_app/android/surface_glue_android.h
@@ -12,7 +12,6 @@
 
 #include <android/native_window_jni.h>
 
-#include "../private/SkMutex.h"
 #include "../Application.h"
 #include "../Window.h"
 
@@ -49,14 +48,10 @@ struct SkiaAndroidApp {
 
     void postMessage(const Message& message) const;
     void readMessage(Message* message) const;
-    void paintIfNeeded();
 
     // This must be called in SkiaAndroidApp's own pthread because the JNIEnv is thread sensitive
     void setTitle(const char* title) const;
 
-    // This posts a kContentInvalidated message if there's no such message currently in the queue
-    void inval();
-
 private:
     pthread_t fThread;
     ANativeWindow* fNativeWindow;
@@ -65,9 +60,6 @@ private:
     JNIEnv* fPThreadEnv;
     jmethodID fSetTitleMethodID;
 
-    bool fIsContentInvalidated = false;  // use this to avoid duplicate invalidate events
-    SkMutex fMutex;
-
     // This must be called in SkiaAndroidApp's own pthread because the JNIEnv is thread sensitive
     ~SkiaAndroidApp();