Small fixes to allow unit tests to compile with gcc 4.7.x (tested with gcc 4.7.2)

gpu/command_buffer/tests/gl_pointcoord_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 22 matching lines @@
 
   GLManager gl_;
 };
 
 GLuint PointCoordTest::SetupQuad(
     GLint position_location, GLfloat pixel_offset) {
   GLuint vbo = 0;
   glGenBuffers(1, &vbo);
   glBindBuffer(GL_ARRAY_BUFFER, vbo);
   float vertices[] = {
-    -0.5 + pixel_offset, -0.5 + pixel_offset,
-     0.5 + pixel_offset, -0.5 + pixel_offset,
-    -0.5 + pixel_offset,  0.5 + pixel_offset,
-     0.5 + pixel_offset,  0.5 + pixel_offset,
+    -0.5f + pixel_offset, -0.5f + pixel_offset,
+     0.5f + pixel_offset, -0.5f + pixel_offset,
+    -0.5f + pixel_offset,  0.5f + pixel_offset,
+     0.5f + pixel_offset,  0.5f + pixel_offset,
   };
   glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
   glEnableVertexAttribArray(position_location);
   glVertexAttribPointer(position_location, 2, GL_FLOAT, GL_FALSE, 0, 0);
 
   return vbo;
 }
 
 namespace {
 
@@ skipping 72 matching lines @@
           // formula for s and t from OpenGL ES 2.0 spec section 3.3
           GLfloat xw = s2p(point_x);
           GLfloat yw = s2p(point_y);
           GLfloat u = xx / max_point_size * 2 - 1;
           GLfloat v = yy / max_point_size * 2 - 1;
           GLint xf = s2p(point_x + u * point_width);
           GLint yf = s2p(point_y + v * point_width);
           GLfloat s = 0.5 + (xf + 0.5 - xw) / max_point_size;
           GLfloat t = 0.5 + (yf + 0.5 - yw) / max_point_size;
           uint8 color[4] = {
-            s * 255,
-            (1 - t) * 255,
+            static_cast<uint8>(s * 255),
+            static_cast<uint8>((1 - t) * 255),
             0,
             255,
           };
           GLTestHelper::CheckPixels(xf, yf, 1, 1, 4, color);
         }
       }
     }
   }
 
   GLTestHelper::CheckGLError("no errors", __LINE__);
 }
 
 }  // namespace gpu