Add drawer with state information

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 a4698336f04b4ea1489eb7a1caaf70b84b5b4f92..fdc4e22dfcba68aadda32e004f3288ce793f836f 100644
--- a/tools/viewer/sk_app/android/surface_glue_android.h
+++ b/tools/viewer/sk_app/android/surface_glue_android.h
@@ -25,7 +25,8 @@ enum MessageType {
     kDestroyApp,
     kContentInvalidated,
     kKeyPressed,
-    kTouched
+    kTouched,
+    kSetState
 };
 
 struct Message {
@@ -35,6 +36,10 @@ struct Message {
     int fTouchOwner, fTouchState;
     float fTouchX, fTouchY;
 
+    // Make sure to delete following SkStrings after consumption
+    SkString* stateName;

[djsollen, 2016/05/24 17:32:40]

don't store pointers just store an SkString

[liyuqian, 2016/05/24 20:18:05]

We'll preserve the pointers because of the message pipes.

+    SkString* stateValue;
+
     Message() {}
     Message(MessageType t) : fType(t) {}
 };
@@ -49,8 +54,9 @@ struct SkiaAndroidApp {
     void postMessage(const Message& message) const;
     void readMessage(Message* message) const;
 
-    // This must be called in SkiaAndroidApp's own pthread because the JNIEnv is thread sensitive
+    // These must be called in SkiaAndroidApp's own pthread because the JNIEnv is thread sensitive
     void setTitle(const char* title) const;
+    void updateState(const char* stateJsonStr) const;
 
 private:
     pthread_t fThread;
@@ -58,7 +64,7 @@ private:
     int fPipes[2];  // 0 is the read message pipe, 1 is the write message pipe
     JavaVM* fJavaVM;
     JNIEnv* fPThreadEnv;
-    jmethodID fSetTitleMethodID;
+    jmethodID fSetTitleMethodID, fUpdateStateMethodID;
 
     // This must be called in SkiaAndroidApp's own pthread because the JNIEnv is thread sensitive
     ~SkiaAndroidApp();