Move copy-surface-as-draw fallback to GrGLGpu.

src/gpu/gl/GrGLCaps.cpp

Index: src/gpu/gl/GrGLCaps.cpp
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index 06ebe3d34d0890468870cd1245f643a9220df16c..5ee75460cf1664476d1c1e0a78260839c95692df 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -942,6 +942,7 @@ GrGLSLCaps::GrGLSLCaps(const GrGLSLCaps& caps) : GrShaderCaps() {
 
 GrGLSLCaps& GrGLSLCaps::operator= (const GrGLSLCaps& caps) {
     INHERITED::operator=(caps);
+    fGLSLGeneration = caps.fGLSLGeneration;
     fDropsTileOnZeroDivide = caps.fDropsTileOnZeroDivide;
     fFBFetchSupport = caps.fFBFetchSupport;
     fFBFetchNeedsCustomOutput = caps.fFBFetchNeedsCustomOutput;
@@ -960,6 +961,8 @@ bool GrGLSLCaps::init(const GrGLContextInfo& ctxInfo,
         return false;
     }
 
+    fGLSLGeneration = ctxInfo.glslGeneration();
+    
     GrGLStandard standard = ctxInfo.standard();
     GrGLVersion version = ctxInfo.version();