Refactor GC to have a class for each different type of GC.

Added a seperate files for mark sweep, partial mark sweep,
sticky mark sweep.

Added a common superclass for GC.

Added additional statistics for each GC.

Moved main garbage collection code away from Heap.cc.

Change-Id: Ida0021ab2f740fc8228bbbf4d43cd9bc56b4ba46
diff --git a/src/gc/partial_mark_sweep.h b/src/gc/partial_mark_sweep.h
new file mode 100644
index 0000000..80a1563
--- /dev/null
+++ b/src/gc/partial_mark_sweep.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ART_SRC_PARTIAL_MARK_SWEEP_H_
+#define ART_SRC_PARTIAL_MARK_SWEEP_H_
+
+#include "locks.h"
+#include "mark_sweep.h"
+#include "utils.h"
+
+namespace art {
+
+class Barrier;
+class CheckObjectVisitor;
+class Class;
+class Heap;
+class MarkIfReachesAllocspaceVisitor;
+class ModUnionClearCardVisitor;
+class ModUnionVisitor;
+class ModUnionTableBitmap;
+class Object;
+class TimingLogger;
+class MarkStackChunk;
+
+class PartialMarkSweep : public MarkSweep {
+ public:
+  virtual GcType GetGcType() const {
+    return kGcTypePartial;
+  }
+
+  explicit PartialMarkSweep(Heap* heap, bool is_concurrent);
+  ~PartialMarkSweep();
+
+protected:
+  virtual void BindBitmaps()
+      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_);
+
+  DISALLOW_COPY_AND_ASSIGN(PartialMarkSweep);
+};
+
+}  // namespace art
+
+#endif  // ART_SRC_PARTIAL_MARK_SWEEP_H_