Track GL buffer state based on unique resource ID

src/gpu/GrGpu.h

Index: src/gpu/GrGpu.h
diff --git a/src/gpu/GrGpu.h b/src/gpu/GrGpu.h
index b3251dc14fa6bc2ca03a37f89d7cdda6ff16b56b..c56f60b75a149bc6e24fb9ced64f6d7071f35013 100644
--- a/src/gpu/GrGpu.h
+++ b/src/gpu/GrGpu.h
@@ -61,6 +61,12 @@ public:
 
     GrPathRendering* pathRendering() { return fPathRendering.get();  }
 
+    /**
+     * Called by GrContext once the resource cache has been initialized. Any GrGpuResource objects
+     * owned by the sublcass need to be initialized here instead of in the constructor.
+     */
+    virtual void initGpuResources();
+
     enum class DisconnectType {
         // No cleanup should be attempted, immediately cease making backend API calls
         kAbandon,
@@ -135,9 +141,13 @@ public:
     /**
      * Creates a buffer.
      *
+     * @param size            size of buffer to create.
+     * @param intendedType    hint to the graphics subsystem about what the buffer will be used for.
+     * @param accessPattern   hint to the graphics subsystem about how the data will be accessed.
+     *
      * @return the buffer if successful, otherwise nullptr.
      */
-    GrBuffer* createBuffer(GrBufferType, size_t size, GrAccessPattern);
+    GrBuffer* createBuffer(size_t size, GrBufferType intendedType, GrAccessPattern accessPattern);
 
     /**
      * Resolves MSAA.
@@ -533,7 +543,7 @@ private:
     virtual GrRenderTarget* onWrapBackendRenderTarget(const GrBackendRenderTargetDesc&,
                                                       GrWrapOwnership) = 0;
     virtual GrRenderTarget* onWrapBackendTextureAsRenderTarget(const GrBackendTextureDesc&) = 0;
-    virtual GrBuffer* onCreateBuffer(GrBufferType, size_t size, GrAccessPattern) = 0;
+    virtual GrBuffer* onCreateBuffer(size_t size, GrBufferType intendedType, GrAccessPattern) = 0;
 
     // overridden by backend-specific derived class to perform the clear.
     virtual void onClear(GrRenderTarget*, const SkIRect& rect, GrColor color) = 0;