Use only one GL context per process, share chaches.

Change-Id: Ieabaa25338d2f4b8d4fd90e7401ad6e7452eae11
diff --git a/libs/hwui/TextureCache.h b/libs/hwui/TextureCache.h
index 452716c..b5e4c7c 100644
--- a/libs/hwui/TextureCache.h
+++ b/libs/hwui/TextureCache.h
@@ -32,6 +32,7 @@
  */
 class TextureCache: public OnEntryRemoved<SkBitmap*, Texture*> {
 public:
+    TextureCache();
     TextureCache(uint32_t maxByteSize);
     ~TextureCache();
 
@@ -78,6 +79,8 @@
      */
     void generateTexture(SkBitmap* bitmap, Texture* texture, bool regenerate = false);
 
+    void init();
+
     GenerationCache<SkBitmap*, Texture*> mCache;
 
     uint32_t mSize;