cc: Clamp texture coordinates in all tile shaders

cc/gl_renderer.cc

Index: cc/gl_renderer.cc
diff --git a/cc/gl_renderer.cc b/cc/gl_renderer.cc
index de6cfc169e3ee1571ba0c8f3119cc7d3354b15fa..b3bad726fbef27b43eb65f2414cddf9aa8695f15 100644
--- a/cc/gl_renderer.cc
+++ b/cc/gl_renderer.cc
@@ -873,18 +873,8 @@ void GLRenderer::drawTileQuad(const DrawingFrame& frame, const TileDrawQuad* qua
         // We should not DCHECK(!clipped) here, because anti-aliasing inflation may cause deviceQuad to become
         // clipped. To our knowledge this scenario does not need to be handled differently than the unclipped case.
     } else {
-        // Move fragment shader transform to vertex shader. We can do this while
-        // still producing correct results as fragmentTexTransformLocation
-        // should always be non-negative when tiles are transformed in a way
-        // that could result in sampling outside the layer.
-        vertexTexScaleX *= fragmentTexScaleX;
-        vertexTexScaleY *= fragmentTexScaleY;
-        vertexTexTranslateX *= fragmentTexScaleX;
-        vertexTexTranslateY *= fragmentTexScaleY;
-        vertexTexTranslateX += fragmentTexTranslateX;
-        vertexTexTranslateY += fragmentTexTranslateY;
-
         GLC(context(), context()->uniform4f(uniforms.vertexTexTransformLocation, vertexTexTranslateX, vertexTexTranslateY, vertexTexScaleX, vertexTexScaleY));
+        GLC(context(), context()->uniform4f(uniforms.fragmentTexTransformLocation, fragmentTexTranslateX, fragmentTexTranslateY, fragmentTexScaleX, fragmentTexScaleY));
 
         localQuad = gfx::RectF(tileRect);
     }