Revert "Child fragment processors are now written as separate functions"

This reverts commit 0364bde2c49616bc9d2f68742d36bfedbeb7e950.

Reason for revert: bot breakage, e.g. https://chromium-swarm.appspot.com/task?id=44942724fab4b710 and https://chromium-swarm.appspot.com/task?id=44938767e5fbb810
Original change's description:
> Child fragment processors are now written as separate functions
> instead of inline
> 
> Bug: skia:
> Change-Id: I3c6c876fea9cfcc311fc09c0fdf0375b776004aa
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/210632
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>

TBR=ethannicholas@google.com,michaelludwig@google.com

Change-Id: If33c1f554a090cd7541878e77712d5ce968ec70a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/211943
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/src/gpu/effects/generated/GrMixerEffect.cpp b/src/gpu/effects/generated/GrMixerEffect.cpp
index 4ffa89c..af5a7af 100644
--- a/src/gpu/effects/generated/GrMixerEffect.cpp
+++ b/src/gpu/effects/generated/GrMixerEffect.cpp
@@ -28,17 +28,19 @@
         weightVar =
                 args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf_GrSLType, "weight");
         SkString _input0 = SkStringPrintf("%s", args.fInputColor);
-        fragBuilder->codeAppendf("half4 _process1272;");
-        this->invokeChild(_outer.fp0_index, _input0.c_str(), "_process1272", args);
-        fragBuilder->codeAppendf("half4 in0 = _process1272;");
+        SkString _child0("_child0");
+        this->emitChild(_outer.fp0_index, _input0.c_str(), &_child0, args);
+        fragBuilder->codeAppendf("half4 in0 = %s;", _child0.c_str());
         SkString _input1 = SkStringPrintf("%s", args.fInputColor);
-        fragBuilder->codeAppendf("half4 _process1330;");
+        SkString _child1("_child1");
         if (_outer.fp1_index >= 0) {
-            this->invokeChild(_outer.fp1_index, _input1.c_str(), "_process1330", args);
+            this->emitChild(_outer.fp1_index, _input1.c_str(), &_child1, args);
+        } else {
+            fragBuilder->codeAppendf("half4 %s;", _child1.c_str());
         }
-        fragBuilder->codeAppendf("\nhalf4 in1 = %s ? _process1330 : %s;\n%s = mix(in0, in1, %s);\n",
-                                 _outer.fp1_index >= 0 ? "true" : "false", args.fInputColor,
-                                 args.fOutputColor,
+        fragBuilder->codeAppendf("\nhalf4 in1 = %s ? %s : %s;\n%s = mix(in0, in1, %s);\n",
+                                 _outer.fp1_index >= 0 ? "true" : "false", _child1.c_str(),
+                                 args.fInputColor, args.fOutputColor,
                                  args.fUniformHandler->getUniformCStr(weightVar));
     }