SF: Rename functions related to mode switching

This change renames several function in SF in order to increase
readibility.

 * performSetActiveMode --> setActiveModeInHwcIfNeeded
 * setActiveModeInternal --> updateInternalStateWithChangedMode
 * setActiveMode --> setActiveModeFromBackdoor

This CL doesn't change behaviour.

Bug: 190982486
Test: m
Change-Id: I2723f66302016ffc196530f2000fce4a44524fb4
diff --git a/services/surfaceflinger/SurfaceFlinger.h b/services/surfaceflinger/SurfaceFlinger.h
index 6093be9..53cbcab 100644
--- a/services/surfaceflinger/SurfaceFlinger.h
+++ b/services/surfaceflinger/SurfaceFlinger.h
@@ -659,13 +659,13 @@
     void onInitializeDisplays() REQUIRES(mStateLock);
     // Sets the desired active mode bit. It obtains the lock, and sets mDesiredActiveMode.
     void setDesiredActiveMode(const ActiveModeInfo& info) REQUIRES(mStateLock);
-    status_t setActiveMode(const sp<IBinder>& displayToken, int id);
+    status_t setActiveModeFromBackdoor(const sp<IBinder>& displayToken, int id);
     // Once HWC has returned the present fence, this sets the active mode and a new refresh
     // rate in SF.
-    void setActiveModeInternal() REQUIRES(mStateLock);
+    void updateInternalStateWithChangedMode() REQUIRES(mStateLock);
     // Calls to setActiveMode on the main thread if there is a pending mode change
     // that needs to be applied.
-    void performSetActiveMode() REQUIRES(mStateLock);
+    void setActiveModeInHwcIfNeeded() REQUIRES(mStateLock);
     void clearDesiredActiveModeState(const sp<DisplayDevice>&) REQUIRES(mStateLock);
     // Called when active mode is no longer is progress
     void desiredActiveModeChangeDone(const sp<DisplayDevice>&) REQUIRES(mStateLock);