Store texture target on GrGLTexture. This is in preparation for using texture targets other than 2D.

src/gpu/gl/GrGLTexture.cpp

Index: src/gpu/gl/GrGLTexture.cpp
diff --git a/src/gpu/gl/GrGLTexture.cpp b/src/gpu/gl/GrGLTexture.cpp
index 6f70d51a341279cfa62d618f341433bff015d42a..29f7423ba559156757c5a28db2bd4d816e0b0121 100644
--- a/src/gpu/gl/GrGLTexture.cpp
+++ b/src/gpu/gl/GrGLTexture.cpp
@@ -30,6 +30,7 @@ void GrGLTexture::init(const GrSurfaceDesc& desc, const IDDesc& idDesc) {
     SkASSERT(0 != idDesc.fTextureID);
     fTexParams.invalidate();
     fTexParamsTimestamp = GrGpu::kExpiredTimestamp;
+    fTarget = idDesc.fTarget;
     fTextureID = idDesc.fTextureID;
     fTextureIDLifecycle = idDesc.fLifeCycle;
 }