Revert "Switched highp float to highfloat and mediump float to half."

This reverts commit 88d99c63878c2d3d340120f0321676f72afcb4f0.

Reason for revert: Believed to be causing unit test failures in Chrome roll:

https://build.chromium.org/p/tryserver.chromium.android/builders/linux_android_rel_ng/builds/364433
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Ftryserver.chromium.android%2Flinux_android_rel_ng%2F364433%2F%2B%2Frecipes%2Fsteps%2Fcontent_browsertests__with_patch__on_Android%2F0%2Flogs%2FWebRtcCaptureFromElementBrowserTest.VerifyCanvasWebGLCaptureColor%2F0

Original change's description:
> Switched highp float to highfloat and mediump float to half.
> 
> The ultimate goal is to end up with "float" and "half", but this
> intermediate step uses "highfloat" so that it is clear if I missed a
> "float" somewhere. Once this lands, a subsequent CL will switch all
> "highfloats" back to "floats".
> 
> Bug: skia:
> Change-Id: Ia13225c7a0a0a2901e07665891c473d2500ddcca
> Reviewed-on: https://skia-review.googlesource.com/31000
> Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
> Reviewed-by: Brian Salomon <bsalomon@google.com>

TBR=bsalomon@google.com,csmartdalton@google.com,ethannicholas@google.com

Change-Id: I8bfa97547ac3920d433665f161d27df3f15c83aa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/35705
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/src/sksl/ast/SkSLASTPrecision.h b/src/sksl/ast/SkSLASTPrecision.h
new file mode 100644
index 0000000000..4b50ed3979
--- /dev/null
+++ b/src/sksl/ast/SkSLASTPrecision.h
@@ -0,0 +1,45 @@
+/*
+ * Copyright 2016 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SKSL_ASTPRECISION
+#define SKSL_ASTPRECISION
+
+#include "SkSLASTDeclaration.h"
+#include "../ir/SkSLModifiers.h"
+
+namespace SkSL {
+
+/**
+ * Represents a precision declaration (e.g. 'precision mediump float;').
+ */
+struct ASTPrecision : public ASTDeclaration {
+    // FIXME handle the type
+    ASTPrecision(Position position, Modifiers::Flag precision)
+    : INHERITED(position, kPrecision_Kind)
+    , fPrecision(precision) {}
+
+    String description() const {
+        switch (fPrecision) {
+            case Modifiers::kLowp_Flag: return String("precision lowp float;");
+            case Modifiers::kMediump_Flag: return String("precision mediump float;");
+            case Modifiers::kHighp_Flag: return String("precision highp float;");
+            default:
+                ASSERT(false);
+                return String("<error>");
+        }
+        ASSERT(false);
+        return String("<error>");
+    }
+
+    const Modifiers::Flag fPrecision;
+
+    typedef ASTDeclaration INHERITED;
+};
+
+} // namespace
+
+#endif