Move state machines to state_machines subdir

third_party/WebKit/Source/core/editing/BackspaceStateMachine.h

Index: third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
diff --git a/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h b/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
index 140442cd7414bda02ebee0db8f437c3f997ab467..e303e2c58a1d769f2f0e74b34135f85db8021688 100644
--- a/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
+++ b/third_party/WebKit/Source/core/editing/BackspaceStateMachine.h
@@ -6,6 +6,7 @@
 #define BackspaceStateMachine_h
 
 #include "core/CoreExport.h"
+#include "core/editing/StateMachineCommon.h"
 #include "wtf/Allocator.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/text/Unicode.h"
@@ -16,15 +17,27 @@ class CORE_EXPORT BackspaceStateMachine {
     STACK_ALLOCATED();
     WTF_MAKE_NONCOPYABLE(BackspaceStateMachine);
 public:
+    enum class State {

[yosin_UTC9, 2016/03/30 08:52:23]

Should we use |MachineState| defined in "StateMachineCommon.h" instead of
|BackspaceStateMachine::State|?

[Seigo Nonaka, 2016/03/30 09:13:23]

Ugh, yes, I'm sorry my brain was messed up by rebasing.
This should be removed.

+        Invalid, // Indicates the state machine is in unknown state.
+        NeedMoreCodeUnit, // Indicates the state machine needs more code units to transit the state.
+        NeedFollowingCodeUnit, // Indicates the state machine needs following code units to transit the state.
+        Finished, // Indicates the state machine found a boundary.
+    };
     BackspaceStateMachine() = default;
 
-    // Returns true when the state machine has stopped.
-    bool updateState(UChar codeUnit);
+    // Prepares by feeding preceding text.
+    // This method must not be called after feedFollowingCodeUnit().
+    MachineState feedPrecedingCodeUnit(UChar codeUnit);
 
-    // Finalize the state machine and returns the code unit count to be deleted.
-    // If the state machine hasn't finished, this method finishes the state
-    // machine first.
-    int finalizeAndGetCodeUnitCountToBeDeleted();
+    // Tells the end of preceding text to the state machine.
+    MachineState tellEndOfPrecedingText();
+
+    // Find boundary offset by feeding following text.
+    // This method must be called after feedPrecedingCodeUnit() returns NeedsFollowingCodeUnit.
+    MachineState feedFollowingCodeUnit(UChar codeUnit);
+
+    // Returns the next boundary offset. This method finalizes the state machine if it is not finished.
+    int finalizeAndGetBoundaryOffset();
 
     // Resets the internal state to the initial state.
     void reset();