Restructure flushing relationship between GrContext, GrDrawingManager, and GrResourceCache.

include/gpu/GrContext.h

Index: include/gpu/GrContext.h
diff --git a/include/gpu/GrContext.h b/include/gpu/GrContext.h
index 5785553dfdeae753b36233d1c81b2e3bfa663cea..749f235a643dbf702d803df76bc2e309054dc787 100644
--- a/include/gpu/GrContext.h
+++ b/include/gpu/GrContext.h
@@ -198,31 +198,10 @@ public:
     // Misc.
 
     /**
-     * Flags that affect flush() behavior.
-     */
-    enum FlushBits {
-        /**
-         * A client may reach a point where it has partially rendered a frame
-         * through a GrContext that it knows the user will never see. This flag
-         * causes the flush to skip submission of deferred content to the 3D API
-         * during the flush.
-         */
-        kDiscard_FlushBit                    = 0x2,
-    };
-
-    /**
      * Call to ensure all drawing to the context has been issued to the
      * underlying 3D API.
-     * @param flagsBitfield     flags that control the flushing behavior. See
-     *                          FlushBits.
      */
-    void flush(int flagsBitfield = 0);
-
-    void flushIfNecessary() {
-        if (fFlushToReduceCacheSize || this->caps()->immediateFlush()) {
-            this->flush();
-        }
-    }
+    void flush();
 
    /**
     * These flags can be used with the read/write pixels functions below.
@@ -456,12 +435,6 @@ private:
     bool didFailPMUPMConversionTest() const;
 
     /**
-     *  This callback allows the resource cache to callback into the GrContext
-     *  when the cache is still over budget after a purge.
-     */
-    static void OverBudgetCB(void* data);
-
-    /**
      * A callback similar to the above for use by the TextBlobCache
      * TODO move textblob draw calls below context so we can use the call above.
      */