Introduce new param caches_array into Cache impl.

When using hob ui interface, we need extra cache fields.
We will save ui required extra cache fields into a separate
cache file. This patch introduce this caches_array parameter.
It will be used in the extra cache implementation (following patch).
Caches_array at least contains CoreRecipeInfo. If users need extra
cache fields support, such as 'hob', caches_array will contain
more relevant elements such as HobRecipeInfo.

(Bitbake rev: d50389ae692377c957afec7c846fc2ce2c070a09)

Signed-off-by: Liping Ke <liping.ke@intel.com>

bitbake/lib/bb/cache.py

@@ -245,7 +245,11 @@ class Cache(object):
     BitBake Cache implementation
     """
 
-    def __init__(self, data):
+    def __init__(self, data, caches_array):
+        # Pass caches_array information into Cache Constructor
+        # It will be used in later for deciding whether we 
+        # need extra cache file dump/load support 
+        self.caches_array = caches_array
         self.cachedir = bb.data.getVar("CACHE", data, True)
         self.clean = set()
         self.checked = set()
@@ -360,7 +364,7 @@ class Cache(object):
         return bb_data[virtual]
 
     @classmethod
-    def parse(cls, filename, appends, configdata):
+    def parse(cls, filename, appends, configdata, caches_array):
         """Parse the specified filename, returning the recipe information"""
         infos = []
         datastores = cls.load_bbfile(filename, appends, configdata)
@@ -393,7 +397,7 @@ class Cache(object):
                 infos.append((virtualfn, self.depends_cache[virtualfn]))
         else:
             logger.debug(1, "Parsing %s", filename)
-            return self.parse(filename, appends, configdata)
+            return self.parse(filename, appends, configdata, self.caches_array)
 
         return cached, infos
 
@@ -623,8 +627,9 @@ class CacheData(object):
     The data structures we compile from the cached data
     """
 
-    def __init__(self):
-        CoreRecipeInfo.init_cacheData(self)        
+    def __init__(self, caches_array):
+        self.caches_array = caches_array
+        CoreRecipeInfo.init_cacheData(self)
         # Direct cache variables
         self.task_queues = {}
         self.preferred = {}