Move several property queries to Properties class

bug:17478770

This removes a lot of redundant property query code, and puts the
queries all in one place, so defining them automatically will be simpler
in the future.

Change-Id: I0428550e6081f07bc6554ffdf73b22284325abb8
diff --git a/libs/hwui/FboCache.cpp b/libs/hwui/FboCache.cpp
index cca3cb7..b2181b6 100644
--- a/libs/hwui/FboCache.cpp
+++ b/libs/hwui/FboCache.cpp
@@ -27,15 +27,8 @@
 // Constructors/destructor
 ///////////////////////////////////////////////////////////////////////////////
 
-FboCache::FboCache(): mMaxSize(DEFAULT_FBO_CACHE_SIZE) {
-    char property[PROPERTY_VALUE_MAX];
-    if (property_get(PROPERTY_FBO_CACHE_SIZE, property, nullptr) > 0) {
-        INIT_LOGD("  Setting fbo cache size to %s", property);
-        mMaxSize = atoi(property);
-    } else {
-        INIT_LOGD("  Using default fbo cache size of %d", DEFAULT_FBO_CACHE_SIZE);
-    }
-}
+FboCache::FboCache()
+        : mMaxSize(Properties::fboCacheSize) {}
 
 FboCache::~FboCache() {
     clear();