gdata: Support mounting archive files in GData cache.

chrome/browser/chromeos/gdata/gdata_files.h

Index: chrome/browser/chromeos/gdata/gdata_files.h
diff --git a/chrome/browser/chromeos/gdata/gdata_files.h b/chrome/browser/chromeos/gdata/gdata_files.h
index b6e5eef122d0eafd0ac97515fc1acccdedcd9c29..e580cdf0ced19633515a4e6ff41196504b05b3f4 100644
--- a/chrome/browser/chromeos/gdata/gdata_files.h
+++ b/chrome/browser/chromeos/gdata/gdata_files.h
@@ -162,6 +162,7 @@ class GDataFile : public GDataEntry {
     CACHE_STATE_PINNED  = 0x1 << 0,
     CACHE_STATE_PRESENT = 0x1 << 1,
     CACHE_STATE_DIRTY   = 0x1 << 2,
+    CACHE_STATE_MOUNTED = 0x1 << 3,
   };
 
   explicit GDataFile(GDataDirectory* parent, GDataRootDirectory* root);
@@ -185,6 +186,9 @@ class GDataFile : public GDataEntry {
   static bool IsCacheDirty(int cache_state) {
     return cache_state & CACHE_STATE_DIRTY;
   }
+  static bool IsCacheMounted(int cache_state) {
+    return cache_state & CACHE_STATE_MOUNTED;
+  }
   static int SetCachePresent(int cache_state) {
     return cache_state |= CACHE_STATE_PRESENT;
   }
@@ -194,6 +198,9 @@ class GDataFile : public GDataEntry {
   static int SetCacheDirty(int cache_state) {
     return cache_state |= CACHE_STATE_DIRTY;
   }
+  static int SetCacheMounted(int cache_state) {
+    return cache_state |= CACHE_STATE_MOUNTED;
+  }
   static int ClearCachePresent(int cache_state) {
     return cache_state &= ~CACHE_STATE_PRESENT;
   }
@@ -203,6 +210,9 @@ class GDataFile : public GDataEntry {
   static int ClearCacheDirty(int cache_state) {
     return cache_state &= ~CACHE_STATE_DIRTY;
   }
+  static int ClearCacheMounted(int cache_state) {
+    return cache_state &= ~CACHE_STATE_MOUNTED;
+  }
 
   DocumentEntry::EntryKind kind() const { return kind_; }
   const GURL& thumbnail_url() const { return thumbnail_url_; }
@@ -354,6 +364,9 @@ class GDataRootDirectory : public GDataDirectory {
     bool IsDirty() const {
       return GDataFile::IsCacheDirty(cache_state);
     }
+    bool IsMounted() const {
+      return GDataFile::IsCacheMounted(cache_state);
+    }
 
     // For debugging purposes.
     std::string ToString() const;