[Chromoting] Implement GlRenderer

remoting/client/gl_math.cc

Index: remoting/client/gl_math.cc
diff --git a/remoting/client/gl_math.cc b/remoting/client/gl_math.cc
index b223ff367344ee5d63becbc75c2940840c04a704..5403b237f58663ec6e0e2cb6c3e3deae5e35226d 100644
--- a/remoting/client/gl_math.cc
+++ b/remoting/client/gl_math.cc
@@ -16,6 +16,8 @@ const int kXScaleKey = 0;
 const int kYScaleKey = 4;
 const int kXOffsetKey = 2;
 const int kYOffsetKey = 5;
+const int kXOffsetKeyTransposed = 6;
+const int kYOffsetKeyTransposed = 7;
 
 }  // namespace
 
@@ -32,6 +34,13 @@ void NormalizeTransformationMatrix(int view_width,
   (*matrix)[kYOffsetKey] /= view_height;
 }
 
+void TransposeTransformationMatrix(std::array<float, 9>* matrix) {
+  (*matrix)[kXOffsetKeyTransposed] = (*matrix)[kXOffsetKey];
+  (*matrix)[kYOffsetKeyTransposed] = (*matrix)[kYOffsetKey];
+  (*matrix)[kXOffsetKey] = 0;
+  (*matrix)[kYOffsetKey] = 0;
+}
+
 void FillRectangleVertexPositions(float left,
                                   float top,
                                   float width,