Cleanup includes in backend/ per IWYU style

Change-Id: I2a0d38bc92b3d9544b3954d4047d5ea8a34ef0bf

backend/BackendManager.cpp

@@ -18,7 +18,9 @@
 
 #include "BackendManager.h"
 
-#include "hwc/HwcDisplay.h"
+#include "drm/DrmConnector.h"
+#include "drm/DrmDevice.h"
+#include "drm/DrmDisplayPipeline.h"
 #include "utils/log.h"
 #include "utils/properties.h"
 

backend/BackendManager.h

@@ -21,10 +21,11 @@
 #include <string>
 #include <vector>
 
-#include "compositor/CompositionPlanner.h"
-
 namespace android::drm_hwcomposer {
 
+class DrmConnector;
+struct DrmDisplayPipeline;
+
 // BackendManager is a singleton that manages the registration of Backends and
 // finding a Backend which can be used to create a DrmDisplayPipeline for a
 // DrmConnector.

backend/ClientBackend.cpp

@@ -15,7 +15,7 @@
  */
 
 #include "backend/GenericBackend.h"
-#include "compositor/GenericCompositionPlanner.h"
+#include "compositor/CompositionPlanner.h"
 #include "hwc/HwcDisplay.h"
 
 namespace android::drm_hwcomposer {

backend/GenericBackend.cpp

@@ -14,9 +14,12 @@
  * limitations under the License.
  */
 
-#include "backend/GenericBackend.h"
+#include "GenericBackend.h"
 
+#include "backend/BackendManager.h"
+#include "compositor/CompositionPlanner.h"
 #include "compositor/GenericCompositionPlanner.h"
+#include "drm/DrmConnector.h"
 #include "drm/DrmDisplayPipeline.h"
 
 namespace android::drm_hwcomposer {

backend/GenericBackend.h

@@ -21,6 +21,9 @@
 
 namespace android::drm_hwcomposer {
 
+class DrmConnector;
+struct DrmDisplayPipeline;
+
 // Implement the Backend interface on top of upstream drm uAPI.
 class GenericBackend : public BackendManager::Backend {
  public: