Move state machines to state_machines subdir

third_party/WebKit/Source/core/editing/state_machines/BackspaceStateMachine.cpp

Index: third_party/WebKit/Source/core/editing/state_machines/BackspaceStateMachine.cpp
diff --git a/third_party/WebKit/Source/core/editing/BackspaceStateMachine.cpp b/third_party/WebKit/Source/core/editing/state_machines/BackspaceStateMachine.cpp
similarity index 54%
rename from third_party/WebKit/Source/core/editing/BackspaceStateMachine.cpp
rename to third_party/WebKit/Source/core/editing/state_machines/BackspaceStateMachine.cpp
index 701c07d0a03426b47cd8239bb53b97ed55bf0a9d..0f14512d1740f548818efeed50d36422a1f89abb 100644
--- a/third_party/WebKit/Source/core/editing/BackspaceStateMachine.cpp
+++ b/third_party/WebKit/Source/core/editing/state_machines/BackspaceStateMachine.cpp
@@ -2,30 +2,26 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "core/editing/BackspaceStateMachine.h"
+#include "core/editing/state_machines/BackspaceStateMachine.h"
 
 #include "wtf/text/Unicode.h"
 
 namespace blink {
 
-int BackspaceStateMachine::finalizeAndGetCodeUnitCountToBeDeleted()
-{
-    if (m_trailSurrogate != 0) {
-        // Unpaired trail surrogate. Removing broken surrogate.
-        ++m_codeUnitsToBeDeleted;
-        m_trailSurrogate = 0;
-    }
-    return m_codeUnitsToBeDeleted;
-}
+namespace {
+const TextSegmentationMachineState kInvalid = TextSegmentationMachineState::Invalid;
+const TextSegmentationMachineState kNeedMoreCodeUnit = TextSegmentationMachineState::NeedMoreCodeUnit;
+const TextSegmentationMachineState kFinished = TextSegmentationMachineState::Finished;
+} // namespace
 
-bool BackspaceStateMachine::updateState(UChar codeUnit)
+TextSegmentationMachineState BackspaceStateMachine::feedPrecedingCodeUnit(UChar codeUnit)
 {
     uint32_t codePoint = codeUnit;
     if (U16_IS_LEAD(codeUnit)) {
         if (m_trailSurrogate == 0) {
             // Unpaired lead surrogate. Aborting with deleting broken surrogate.
             ++m_codeUnitsToBeDeleted;
-            return true;
+            return kFinished;
         }
         codePoint = U16_GET_SUPPLEMENTARY(codeUnit, m_trailSurrogate);
         m_trailSurrogate = 0;
@@ -33,21 +29,47 @@ bool BackspaceStateMachine::updateState(UChar codeUnit)
         if (m_trailSurrogate != 0) {
             // Unpaired trail surrogate. Aborting with deleting broken
             // surrogate.
-            return true;
+            return kFinished;
         }
         m_trailSurrogate = codeUnit;
-        return false; // Needs surrogate lead.
+        return kNeedMoreCodeUnit;
     } else {
         if (m_trailSurrogate != 0) {
             // Unpaired trail surrogate. Aborting with deleting broken
             // surrogate.
-            return true;
+            return kFinished;
         }
     }
 
     // TODO(nona): Handle emoji sequences.
     m_codeUnitsToBeDeleted = U16_LENGTH(codePoint);
-    return true;
+    return kFinished;
+}
+
+TextSegmentationMachineState BackspaceStateMachine::tellEndOfPrecedingText()
+{
+    if (m_trailSurrogate != 0) {
+        // Unpaired trail surrogate. Removing broken surrogate.
+        ++m_codeUnitsToBeDeleted;
+        m_trailSurrogate = 0;
+    }
+    return kFinished;
+}
+
+TextSegmentationMachineState BackspaceStateMachine::feedFollowingCodeUnit(UChar codeUnit)
+{
+    NOTREACHED();
+    return kInvalid;
+}
+
+int BackspaceStateMachine::finalizeAndGetBoundaryOffset()
+{
+    if (m_trailSurrogate != 0) {
+        // Unpaired trail surrogate. Removing broken surrogate.
+        ++m_codeUnitsToBeDeleted;
+        m_trailSurrogate = 0;
+    }
+    return -m_codeUnitsToBeDeleted;
 }
 
 void BackspaceStateMachine::reset()